CN109861735B - Radio frequency front-end circuit and mobile terminal - Google Patents
Radio frequency front-end circuit and mobile terminal Download PDFInfo
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- CN109861735B CN109861735B CN201910222066.8A CN201910222066A CN109861735B CN 109861735 B CN109861735 B CN 109861735B CN 201910222066 A CN201910222066 A CN 201910222066A CN 109861735 B CN109861735 B CN 109861735B
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- 230000008054 signal transmission Effects 0.000 claims abstract description 23
- 238000013461 design Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention provides a radio frequency front-end circuit and a mobile terminal. The circuit includes: a first double pole double throw switch; a first signal receiving circuit connected to one of the first antenna and the second antenna through a first double-pole double-throw switch, and receiving a signal through the connected antenna; a second double pole double throw switch; a second signal receiving circuit connected to one of the third antenna and the fourth antenna through a second double-pole double-throw switch, and receiving a signal through the connected antenna; the third double-pole double-throw switch is respectively connected with the first double-pole double-throw switch and the second double-pole double-throw switch; the first radio frequency circuit is connected with the third double-pole double-throw switch and comprises: a signal receiving mode or a signal transmitting mode; a second radio frequency circuit connected to the third double-pole double-throw switch, comprising: a signal reception mode or a signal transmission mode. The circuit of the invention has simple design, and can shorten the radio frequency layout wiring on the basis of realizing signal transmission and/or reception, thereby reducing the path difference loss.
Description
Technical Field
The embodiment of the invention relates to the technical field of terminal application, in particular to a radio frequency front-end circuit and a mobile terminal.
Background
With the rapid development of internet communication technology and the continuous popularization of mobile intelligent terminals, the demand of users for data traffic is increasing. The transmission rate from 4G is 100Mbps to 1Gbps, the peak transmission rate to 5G NR can reach 20Gbps, and the improvement of the rate requires a key technology of 4 × 4 Multiple Input Multiple Output (MIMO) for 5G.
As shown in fig. 1, which is a schematic structural diagram of a radio frequency front end circuit of a 5G mobile terminal device, the circuit architecture is configured to implement a one-transmission four-reception 1T4R and a two-transmission four-reception 2T4R, where a path difference loss is directly affected by layout and routing of the 5G mobile terminal device, and as shown in fig. 1, a routing line length of a radio frequency front end circuit structure of an existing 5G mobile terminal device is long, which results in a high path difference loss. In addition, the existing radio frequency front end circuit structure of the 5G mobile terminal device usually uses a three-pole three-throw switch, the higher the signal transmission frequency is, the larger the bandwidth is, the larger the component difference loss is, and the difficulty in realizing that the output power reaches the specification is also increased. Therefore, how to reduce the path loss, the device loss and the complexity of the circuit design is an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a radio frequency front end circuit and a mobile terminal, and aims to solve the problem of high path difference loss caused by long routing wire of the radio frequency front end circuit structure of the existing 5G mobile terminal equipment.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a radio frequency front-end circuit, including:
a first double pole double throw switch;
a first signal receiving circuit connected to a first target antenna of the first antenna and the second antenna through the first double-pole double-throw switch, and receiving a signal through the first target antenna;
a second double pole double throw switch;
a second signal receiving circuit, connected to a second target antenna of the third antenna and the fourth antenna through the second double-pole double-throw switch, for receiving a signal through the second target antenna;
a third double-pole double-throw switch connected to the first double-pole double-throw switch and the second double-pole double-throw switch, respectively;
a first radio frequency circuit connected to the third double pole double throw switch, comprising: a signal reception mode or a signal transmission mode;
a second radio frequency circuit connected to the third double pole double throw switch, comprising: a signal reception mode or a signal transmission mode.
In a second aspect, an embodiment of the present invention further provides a mobile terminal, including:
a controller; and (c) a second step of,
the rf front-end circuit according to the above embodiment;
the controller is used for controlling the opening and closing of the first double-pole double-throw switch, the opening and closing of the second double-pole double-throw switch and/or the opening and closing of the third double-pole double-throw switch.
In the above solution of the embodiment of the present invention, through the third double-pole double-throw switch connected to the first double-pole double-throw switch and the second double-pole double-throw switch, the first double-pole double-throw switch is further connected to the first antenna, the second antenna and the first signal receiving circuit, and the second double-pole double-throw switch is further connected to the third antenna, the fourth antenna and the second signal receiving circuit, so that the first radio frequency circuit and the second radio frequency circuit connected to the third double-pole double-throw switch can flexibly receive and/or transmit signals through any antenna.
Drawings
Fig. 1 is a schematic diagram of a rf front-end circuit in the prior art;
fig. 2 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Fig. 2 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present invention. The radio frequency front-end circuit comprises: a first double pole double throw switch 1; a first signal receiving circuit 2 connected to a first target antenna of the first antenna 3 and the second antenna 4 through a first double pole double throw switch 1, and receiving a signal through the first target antenna; a second double-pole double-throw switch 5; a second signal receiving circuit 6, which is connected to a second target antenna of the third antenna 7 and the fourth antenna 8 through a second double-pole double-throw switch 5, and receives a signal through the second target antenna; the third double-pole double-throw switch 9 is respectively connected with the first double-pole double-throw switch 1 and the second double-pole double-throw switch 5; a first rf circuit 10 connected to the third double-pole double-throw switch 9, including: a signal receiving mode or a signal transmitting mode; the second radio frequency circuit 11, connect with the third double pole double throw switch 9, include: a signal reception mode or a signal transmission mode.
Here, the first target antenna is the first antenna 3 or the second antenna 4. The second target antenna is the third antenna 7 or the fourth antenna 8.
It should be noted that, the double-pole double-throw switch itself has small element difference loss and good isolation, and the double-pole double-throw switch is selected in the invention, namely the first double-pole double-throw switch 1, the second double-pole double-throw switch 5 and the third double-pole double-throw switch 9, so that not only can the transmission performance of the radio frequency front-end circuit be improved, but also the receiving performance of the radio frequency front-end circuit can be improved.
Here, through the third double-pole double-throw switch 9 connected to the first double-pole double-throw switch 1 and the second double-pole double-throw switch 5, wherein the first double-pole double-throw switch 1 is further connected to the first antenna 3, the second antenna 4 and the first signal receiving circuit 2, respectively, and the second double-pole double-throw switch 5 is further connected to the third antenna 7, the fourth antenna 8 and the second signal receiving circuit 6, respectively, so that the first radio frequency circuit 10 and the second radio frequency circuit 11 connected to the third double-pole double-throw switch 9, respectively, can flexibly receive and/or transmit signals through any antenna, the circuit design is simple, and on the basis of realizing signal transmission and/or reception, the radio frequency layout can be shortened, thereby reducing path difference loss.
Here, the first double pole double throw switch 1 includes: the antenna comprises a first movable end, a second movable end, a first fixed end and a second fixed end, wherein the first movable end is connected with a first signal receiving circuit 2, the first fixed end is connected with a first antenna 3, and the second fixed end is connected with a second antenna 4.
Here, the first double pole double throw switch 1 is used to connect the first movable terminal to the first fixed terminal or the second fixed terminal, and is also used to connect the second movable terminal to the first fixed terminal or the second fixed terminal.
The second double pole double throw switch 5 includes: the antenna comprises a third movable end, a fourth movable end, a third fixed end and a fourth fixed end, wherein the third movable end is connected with a second signal receiving circuit 6, the third fixed end is connected with a third antenna 7, and the fourth fixed end is connected with a fourth antenna 8.
Here, the second double pole double throw switch 5 is used for connecting the third active terminal with the third fixed terminal or the fourth fixed terminal, and is also used for connecting the fourth active terminal with the third fixed terminal or the fourth fixed terminal.
The third double pole double throw switch 9 includes: the radio frequency unit comprises a fifth movable end, a sixth movable end, a fifth fixed end and a sixth fixed end, wherein the fifth movable end is connected with the first radio frequency circuit 10, the sixth movable end is connected with the second radio frequency circuit 11, the fifth fixed end is connected with the second movable end, and the sixth fixed end is connected with the fourth movable end.
Here, the third double pole double throw switch 9 is used for connecting the fifth movable terminal to the fifth fixed terminal or the sixth fixed terminal, and also for connecting the sixth movable terminal to the fifth fixed terminal or the sixth fixed terminal.
Optionally, as shown in fig. 2, the first radio frequency circuit 10 includes: a first low noise amplifier 12, a first power amplifier 13, a first switch 14, and a first filter 15 respectively connected to the fifth active terminal of the third double-pole double-throw switch 9 and the first switch 14.
Specifically, when the first low noise amplifier 12 is connected to the first filter 15 through the first switch 14, the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, the first radio frequency circuit 10 is in a signal receiving mode.
Or, when the first low noise amplifier 12 is connected to the first filter 15 through the first switch 14, and the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, the first radio frequency circuit 10 is in the signal receiving mode.
When the first low noise amplifier 12 is connected to the first filter 15 via the first changeover switch 14, the first low noise amplifier 12 and the first filter 15 form a signal receiving circuit.
Based on this, when the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, since the first fixed terminal of the first double-pole double-throw switch 1 is connected with the first antenna 3, and the second fixed terminal is connected with the second antenna 4, the signal receiving circuit can receive signals through one of the first antenna 3 and the second antenna 4.
When the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, since the third fixed terminal of the second double-pole double-throw switch 5 is connected with the third antenna 7 and the fourth fixed terminal is connected with the fourth antenna 8, the signal receiving circuit can receive signals through one of the third antenna 7 and the fourth antenna 8.
Here, the signal receiving circuit of the first radio frequency circuit 10 can flexibly receive a signal through any one of the antennas by the third double-pole double-throw switch 9 connected to the first double-pole double-throw switch 1 and the second double-pole double-throw switch 5, and thus can shorten a radio frequency layout trace and reduce a path loss.
In an example, if the first signal receiving circuit is connected to the first antenna 3 through the first double pole double throw switch 1 and the second signal receiving circuit is connected to the third antenna 7 through the second double pole double throw switch 5, the signal receiving circuit formed by the first low noise amplifier 12 and the first filter 15 may be connected to the second antenna 4 through the third double pole double throw switch 9 and the first double pole double throw switch 1, or the signal receiving circuit formed by the first low noise amplifier 12 and the first filter 15 may be connected to the fourth antenna 8 through the third double pole double throw switch 9 and the second double pole double throw switch 5.
Specifically, the first power amplifier 13 is connected to the first filter 15 through the first switch 14, the fifth active end of the third double-pole double-throw switch 9 is communicated with the fifth fixed end thereof, and when the second active end of the first double-pole double-throw switch 1 is communicated with one of the first fixed end and the second fixed end thereof, the first radio frequency circuit 10 is in a signal transmission mode;
or, when the first power amplifier 13 is connected to the first filter 15 through the first switch 14, the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, the first radio frequency circuit 10 is in the signal transmission mode.
When the first power amplifier 13 is connected to the first filter 15 via the first changeover switch 14, the first power amplifier 13 and the first filter 15 form a signal transmission circuit.
Based on this, when the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, since the first fixed terminal of the first double-pole double-throw switch 1 is connected with the first antenna 3, and the second fixed terminal is connected with the second antenna 4, the signal transmitting circuit can transmit a signal through one of the first antenna 3 and the second antenna 4.
When the fifth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, since the third fixed terminal of the second double-pole double-throw switch 5 is connected with the third antenna 7 and the fourth fixed terminal is connected with the fourth antenna 8, the signal transmitting circuit can transmit a signal through one of the third antenna 7 and the fourth antenna 8.
Here, the signal transmitting circuit of the first radio frequency circuit 10 can flexibly transmit a signal through any antenna by the third double-pole double-throw switch 9 connected to the first double-pole double-throw switch 1 and the second double-pole double-throw switch 5, so that radio frequency layout wiring can be shortened, and path loss can be reduced.
In an example, if the first signal receiving circuit is connected to the first antenna 3 through the first double-pole double-throw switch 1 and the second signal receiving circuit is connected to the third antenna 7 through the second double-pole double-throw switch 5, the signal transmitting circuit formed by the first power amplifier 13 and the first filter 15 may be connected to the second antenna 4 through the third double-pole double-throw switch 9 and the first double-pole double-throw switch 1, or the signal transmitting circuit formed by the first power amplifier 13 and the first filter 15 may be connected to the fourth antenna 8 through the third double-pole double-throw switch 9 and the second double-pole double-throw switch 5.
Here, the first change-over switch 14 is optionally a single-pole double-throw switch, comprising a movable terminal and two fixed terminals. The active terminal of the first power amplifier is connected to the first filter 15, one of the fixed terminals is connected to the input terminal of the first low noise amplifier 12, and the other fixed terminal is connected to the output terminal of the first power amplifier 13.
Optionally, as shown in fig. 2, the second radio frequency circuit 11 includes: a second low noise amplifier 16, a second power amplifier 17, a second switch 18, and a second filter 19 respectively connected to the sixth active terminal of the third double-pole double-throw switch 9 and the second switch 18.
Specifically, the second low noise amplifier 16 is connected to the second filter 19 through the second switch 18, the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and when the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, the second rf circuit 11 is in the signal receiving mode.
Or, when the second low noise amplifier 16 is connected to the second filter 19 through the second switch 18, and the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, the second radio frequency circuit 11 is in the signal receiving mode.
When the second low noise amplifier 16 is connected to the second filter 19 via the second switch 18, the second low noise amplifier 16 and the second filter 19 form a signal receiving circuit.
Based on this, when the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, since the first fixed terminal of the first double-pole double-throw switch 1 is connected with the first antenna 3, and the second fixed terminal is connected with the second antenna 4, the signal receiving circuit can receive signals through one of the first antenna 3 and the second antenna 4.
When the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, since the third fixed terminal of the second double-pole double-throw switch 5 is connected with the third antenna 7 and the fourth fixed terminal is connected with the fourth antenna 8, the signal receiving circuit can receive signals through one of the third antenna 7 and the fourth antenna 8.
Here, the signal receiving circuit of the second radio frequency circuit 11 can flexibly receive a signal through any one of the antennas by the third double-pole double-throw switch 9 connected to the first double-pole double-throw switch 1 and the second double-pole double-throw switch 5, and thus can shorten a radio frequency layout trace and reduce a path loss.
In one example, if a first signal receiving circuit is connected to the first antenna 3 through the first double-pole double-throw switch 1, a second signal receiving circuit is connected to the third antenna 7 through the second double-pole double-throw switch 5, and the first rf circuit 10 is connected to the second antenna 4, the second low noise amplifier 16 and the second filter 19 form a signal receiving circuit, which is connected to the fourth antenna 8 through the third double-pole double-throw switch 9 and the second double-pole double-throw switch 5.
In another example, if the first signal receiving circuit is connected to the first antenna 3 through the first double-pole double-throw switch 1, the second signal receiving circuit is connected to the third antenna 7 through the second double-pole double-throw switch 5, and the first rf circuit 10 is connected to the fourth antenna 8 through the third double-pole double-throw switch 9 and the second double-pole double-throw switch 5, the second low noise amplifier 16 and the second filter 19 form a signal receiving circuit, which is connected to the second antenna 4 through the third double-pole double-throw switch 9 and the first double-pole double-throw switch 1.
Specifically, the second power amplifier 17 is connected to the second filter 19 through the second switch 18, and when the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, the second radio frequency circuit 11 is in a signal transmission mode.
Or, the second power amplifier 17 is connected to the second filter 19 through the second switch 18, and when the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, the second radio frequency circuit 11 is in the signal transmission mode.
When the second power amplifier 17 is connected to the second filter 19 via the second switch 18, the second power amplifier 17 and the second filter 19 form a signal transmitting circuit.
Based on this, when the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the fifth fixed terminal thereof, and the second active terminal of the first double-pole double-throw switch 1 is communicated with one of the first fixed terminal and the second fixed terminal thereof, since the first fixed terminal of the first double-pole double-throw switch 1 is connected with the first antenna 3, and the second fixed terminal is connected with the second antenna 4, the signal transmitting circuit can transmit signals through one of the first antenna 3 and the second antenna 4.
When the sixth active terminal of the third double-pole double-throw switch 9 is communicated with the sixth fixed terminal thereof, and the fourth active terminal of the second double-pole double-throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, since the third fixed terminal of the second double-pole double-throw switch 5 is connected with the third antenna 7 and the fourth fixed terminal is connected with the fourth antenna 8, the signal transmitting circuit can transmit signals through one of the third antenna 7 and the fourth antenna 8.
Here, the signal transmitting circuit of the second radio frequency circuit 11 can flexibly transmit a signal through any antenna by the third double-pole double-throw switch 9 connected to the first double-pole double-throw switch 1 and the second double-pole double-throw switch 5, so that radio frequency layout wiring can be shortened, and path loss can be reduced.
In one example, if the first signal receiving circuit is connected to the first antenna 3 through the first double-pole double-throw switch 1, the second signal receiving circuit is connected to the third antenna 7 through the second double-pole double-throw switch 5, and the first rf circuit 10 is connected to the second antenna 4, the second power amplifier 17 and the second filter 19 form a signal transmitting circuit, which is connected to the fourth antenna 8 through the third double-pole double-throw switch 9 and the second double-pole double-throw switch 5.
In another example, if the first signal receiving circuit is connected to the first antenna 3 through the first double-pole double-throw switch 1, the second signal receiving circuit is connected to the third antenna 7 through the second double-pole double-throw switch 5, and the first rf circuit 10 is connected to the fourth antenna 8 through the third double-pole double-throw switch 9 and the second double-pole double-throw switch 5, the second power amplifier 17 and the second filter 19 form a signal transmitting circuit, which is connected to the second antenna 4 through the third double-pole double-throw switch 9 and the first double-pole double-throw switch 1.
Here, optionally, the second change-over switch 18 is a single-pole double-throw switch, comprising a movable terminal and two fixed terminals. The active terminal of the second filter is connected to the second filter 19, one of the fixed terminals is connected to the input terminal of the second low noise amplifier 16, and the other fixed terminal is connected to the output terminal of the second power amplifier 17.
Alternatively, the first signal receiving circuit 2 includes: a third low noise amplifier 20 and a third filter 21.
Specifically, the third filter 21 is respectively connected to the input end of the third low noise amplifier 20 and the first active end of the first double-pole double-throw switch 1; when the first active end of the first double-pole double-throw switch 1 is connected to one of the first fixed end and the second fixed end thereof, the first signal receiving circuit 2 is turned on.
It should be noted that, when the first active end of the first double-pole double-throw switch 1 is communicated with one of the first fixed end and the second fixed end thereof, since the first fixed end of the first double-pole double-throw switch 1 is connected with the first antenna 3 and the second fixed end is connected with the second antenna 4, the first signal receiving circuit 2 can receive signals through one of the first antenna 3 and the second antenna 4.
Here, since the double-pole double-throw switch itself has a small element difference loss and a good isolation, not only the reception performance of the first signal reception circuit 2 but also the reception performance or the transmission performance of the first radio frequency circuit 10 or the second radio frequency circuit 11 can be improved by the third double-pole double-throw switch 9 connected to the first double-pole double-throw switch 1.
Alternatively, the second signal receiving circuit 6 includes: a fourth low noise amplifier 22 and a fourth filter 23.
Specifically, the fourth filter 23 is respectively connected to the input terminal of the fourth low noise amplifier 22 and the third active terminal of the second double-pole double-throw switch 5; when the third active terminal of the second double-pole double-throw switch 5 is connected to one of the third fixed terminal and the fourth fixed terminal thereof, the second signal receiving circuit 6 is turned on.
It should be noted that, when the third active terminal of the second double pole double throw switch 5 is communicated with one of the third fixed terminal and the fourth fixed terminal thereof, since the third fixed terminal of the second double pole double throw switch 5 is connected to the third antenna 7 and the fourth fixed terminal is connected to the fourth antenna 8, the second signal receiving circuit 6 can receive signals through one of the third antenna 7 and the fourth antenna 8.
Here, since the double-pole double-throw switch itself has a small element difference loss and a good isolation, not only the reception performance of the second signal reception circuit 6 can be improved, but also the reception performance or the transmission performance of the first radio frequency circuit 10 or the second radio frequency circuit 11 can be improved by the third double-pole double-throw switch 9 connected to the second double-pole double-throw switch 5.
Further, the rf front-end circuit according to an embodiment of the present invention further includes: a radio frequency transceiver (not shown) connected to the first signal receiving circuit 2, the second signal receiving circuit 6, the first radio frequency circuit 10 and the second radio frequency circuit 11 respectively.
Specifically, the radio frequency transceiver may include: the first signal receiving port, the second signal receiving port, the third signal receiving port, the fourth signal receiving port, the first signal transmitting port and the second signal transmitting port.
Wherein, the first signal receiving port is connected with the output end of the third low noise amplifier 20 in the first signal receiving circuit 2; the second signal receiving port is connected with the output end of the first low noise amplifier 12 in the first radio frequency circuit 10; the third signal receiving port is connected with the output end of the second low noise amplifier 16 in the second radio frequency circuit 11; the fourth signal receiving port is connected to the output terminal of the fourth low noise amplifier 22 in the second signal receiving circuit 6.
The first signal transmitting port is connected with the input end of a first power amplifier 13 in the first radio frequency circuit 10; the second signal transmission port is connected to an input of a second power amplifier 17 in the second radio frequency circuit 11.
The rf front-end circuit shown in fig. 2 can implement 1T4R/2T4R functions of a 5G NR system, and ensure 1-channel transmission and 4-channel reception functions; or 2-path transmitting and 4-path receiving functions.
The transmission of signals in the rf front-end circuit of the present invention is briefly described with reference to fig. 2.
For the transmit path:
for example, after a first transmission signal is sent by a radio frequency transceiver (not shown), the signal may be amplified by a first power amplifier 13, pass through a first switch 14, be filtered by a first filter 15, and then pass through a third double-pole double-throw switch 9:
1) after the antenna can be selectively switched to the first double-pole double-throw switch 1, a signal is transmitted from the first antenna 3 or the second antenna 4;
2) after being selectively switched to the second double-pole double-throw switch 5, the signal is transmitted from the third antenna 7 or the fourth antenna 8.
For example, after the second transmission signal is sent by the radio frequency transceiver (not shown in the figure), the signal may be amplified by the second power amplifier 17, pass through the second switch 18, be filtered by the second filter 19, and then pass through the third double-pole double-throw switch 9:
1)1) after the first double-pole double-throw switch 1 is selected to be switched, a signal is transmitted from the first antenna 3 or the second antenna 4;
2) optionally, the switch to the second double pole double throw switch 5 can be switched to transmit the signal from the third antenna 7 or the fourth antenna 8.
It should be noted that, if the first transmission signal is transmitted through one of the first antenna 3 and the second antenna 4 via the third double-pole double-throw switch 9 and the first double-pole double-throw switch 1, the second transmission signal is transmitted through the third double-pole double-throw switch 9 and the second double-pole double-throw switch 5 via the third antenna 7 or the fourth antenna 8.
For the receive path:
since the 5G NR system needs to support 4 paths of simultaneous reception, the first received signal can be received by the first antenna 3, then passes through the first double-pole double-throw switch 1, is filtered by the third filter 21, and then enters the third low noise amplifier 20, where the signal is amplified and then transmitted to the radio frequency transceiver for subsequent processing.
After being received by the second antenna 4, the second received signal is switched from the first double-pole double-throw switch 1 to the third double-pole double-throw switch 9, filtered by the first filter 15, switched to the first low noise amplifier 12 by the first switch 14, amplified and transmitted to the radio frequency transceiver for subsequent processing.
It should be understood that the signal transmission path of the first received signal and the signal transmission path of the second received signal are only an example. That is, after passing through the first antenna 3 or the second antenna 4, the received signal passes through the first double-pole double-throw switch 1 and can be selectively switched to a receiving path including a third low noise amplifier according to actual conditions; or,
and then selectively switched to a receiving path including a first low noise amplifier or switched to a receiving path including a second low noise amplifier through a third double-pole double-throw switch 9, which is not specifically limited herein.
The third received signal may be received by the third antenna 7, pass through the second double-pole double-throw switch 5, and then be filtered by the fourth filter 23, and enter the fourth low noise amplifier 22, where the signal is amplified and then transmitted to the rf transceiver for subsequent processing.
After being received by the fourth antenna 8, the fourth received signal is switched to the third double-pole double-throw switch 9 by the second double-pole double-throw switch 5, filtered by the second filter 19, and then switched to the second low noise amplifier 16 by the second switch 18, and then the signal is amplified and transmitted to the radio frequency transceiver for subsequent processing.
It should be understood that the signal transmission path of the third received signal and the signal transmission path of the fourth received signal are only examples, that is, after the received signal is received by the third antenna 7 or the fourth antenna 8, the received signal can be selectively switched to the receiving path including the fourth low noise amplifier through the first double pole double throw switch 1 according to actual situations; or,
and then selectively switched to a receiving path including the first low noise amplifier or switched to a receiving path including the second low noise amplifier through the third double-pole double-throw switch 9, which is not specifically limited herein.
The radio frequency front-end circuit provided by the embodiment of the invention has the advantages that through the third double-pole double-throw switch respectively connected with the first double-pole double-throw switch and the second double-pole double-throw switch, the first double-pole double-throw switch is also respectively connected with the first antenna, the second antenna and the first signal receiving circuit, and the second double-pole double-throw switch is also respectively connected with the third antenna, the fourth antenna and the second signal receiving circuit, so that the first radio frequency circuit and the second radio frequency circuit respectively connected with the third double-pole double-throw switch can flexibly receive and/or transmit signals through any antenna.
In addition, it should be noted that, in order to shorten the circuit design time of the manufacturer and reduce the cost, the rf front-end circuit of the present invention can be integrated into an integrated circuit chip.
An embodiment of the present invention further provides a mobile terminal, including: a controller; and, the rf front end circuit as described in the above embodiments; the controller is used for controlling the opening and closing of the first double-pole double-throw switch, the opening and closing of the second double-pole double-throw switch and/or the opening and closing of the third double-pole double-throw switch.
The controller is also used for controlling the closing of the first change-over switch and/or the opening and closing of the second change-over switch.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. An rf front-end circuit, comprising:
a first double pole double throw switch;
a first signal receiving circuit connected to a first target antenna of the first antenna and the second antenna through the first double-pole double-throw switch, and receiving a signal through the first target antenna;
a second double pole double throw switch;
a second signal receiving circuit, connected to a second target antenna of the third antenna and the fourth antenna through the second double-pole double-throw switch, for receiving a signal through the second target antenna;
a third double-pole double-throw switch connected to the first double-pole double-throw switch and the second double-pole double-throw switch, respectively;
a first radio frequency circuit connected to the third double-pole double-throw switch, comprising: a signal reception mode or a signal transmission mode;
a second radio frequency circuit connected to the third double pole double throw switch, comprising: a signal reception mode or a signal transmission mode;
the third double pole double throw switch comprises: a fifth movable end, a sixth movable end, a fifth fixed end and a sixth fixed end; the fifth movable end is connected with the first radio frequency circuit, and the sixth movable end is connected with the second radio frequency circuit;
the first double pole double throw switch comprises: the device comprises a first movable end, a second movable end, a first fixed end and a second fixed end; the first movable end is connected with the first signal receiving circuit, the first fixed end is connected with the first antenna, and the second fixed end is connected with the second antenna;
the second double pole double throw switch comprises: a third movable end, a fourth movable end, a third fixed end and a fourth fixed end; the third movable end is connected with the second signal receiving circuit, the third fixed end is connected with the third antenna, and the fourth fixed end is connected with the fourth antenna;
the fifth fixed end is connected with the second movable end, and the sixth fixed end is connected with the fourth movable end;
the first radio frequency circuit includes: a first low noise amplifier, a first power amplifier, a first switch, and a first filter respectively connected to the fifth active terminal and the first switch;
when the first low noise amplifier is connected with the first filter through the first selector switch, the fifth movable end is communicated with the fifth fixed end, and the second movable end is communicated with one of the first fixed end and the second fixed end, the first radio frequency circuit is in a signal receiving mode; or, when the first low noise amplifier is connected to the first filter through the first switch, the fifth active terminal is communicated with the sixth fixed terminal, and the fourth active terminal is communicated with one of the third fixed terminal and the fourth fixed terminal, the first radio frequency circuit is in a signal receiving mode;
the first power amplifier is connected with the first filter through the first selector switch, the fifth movable end is communicated with the fifth fixed end, and when the second movable end is communicated with one of the first fixed end and the second fixed end, the first radio frequency circuit is in a signal transmission mode; or, when the first power amplifier is connected to the first filter through the first switch, the fifth active terminal is communicated with the sixth fixed terminal, and the fourth active terminal is communicated with one of the third fixed terminal and the fourth fixed terminal, the first radio frequency circuit is in a signal transmission mode;
the second radio frequency circuit includes: the second low noise amplifier, the second power amplifier, the second change-over switch and the second filter are respectively connected with the sixth active terminal and the second change-over switch;
the second low noise amplifier is connected with the second filter through the second selector switch, the sixth active end is communicated with the fifth fixed end, and when the second active end is communicated with one of the first fixed end and the second fixed end, the second radio frequency circuit is in a signal receiving mode; or, when the second low noise amplifier is connected to the second filter through the second switch, the sixth active terminal is communicated with the sixth fixed terminal, and the fourth active terminal is communicated with one of the third fixed terminal and the fourth fixed terminal, the second rf circuit is in a signal receiving mode;
the second power amplifier is connected with the second filter through the second selector switch, the sixth movable end is communicated with the fifth fixed end, and the second radio frequency circuit is in a signal transmission mode when the second movable end is communicated with one of the first fixed end and the second fixed end; or, when the second power amplifier is connected to the second filter through the second switch, the sixth active end is communicated with the sixth fixed end, and the fourth active end is communicated with one of the third fixed end and the fourth fixed end, the second rf circuit is in a signal transmitting mode.
2. The rf front-end circuit of claim 1, wherein the first signal receiving circuit comprises: a third low noise amplifier and a third filter;
the third filter is respectively connected with the input end of the third low noise amplifier and the first movable end;
when the first movable end is communicated with one of the first fixed end and the second fixed end, the first signal receiving circuit is conducted.
3. The rf front-end circuit of claim 1, wherein the second signal receiving circuit comprises: a fourth low noise amplifier and a fourth filter;
the fourth filter is respectively connected with the input end of the fourth low noise amplifier and the third movable end;
when the third movable end is connected with one of the third fixed end and the fourth fixed end, the second signal receiving circuit is conducted.
4. The rf front-end circuit of claim 1, further comprising:
and the radio frequency transceiver is respectively connected with the first signal receiving circuit, the second signal receiving circuit, the first radio frequency circuit and the second radio frequency circuit.
5. A mobile terminal, comprising:
a controller; and (c) a second step of,
the RF front-end circuit of any one of claims 1 to 4;
the controller is used for controlling the opening and closing of the first double-pole double-throw switch, the opening and closing of the second double-pole double-throw switch and/or the opening and closing of the third double-pole double-throw switch.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910222066.8A CN109861735B (en) | 2019-03-22 | 2019-03-22 | Radio frequency front-end circuit and mobile terminal |
| PCT/CN2020/078864 WO2020192426A1 (en) | 2019-03-22 | 2020-03-11 | Radio frequency front-end circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910222066.8A CN109861735B (en) | 2019-03-22 | 2019-03-22 | Radio frequency front-end circuit and mobile terminal |
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| Publication Number | Publication Date |
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| CN109861735A CN109861735A (en) | 2019-06-07 |
| CN109861735B true CN109861735B (en) | 2022-07-15 |
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| CN201910222066.8A Active CN109861735B (en) | 2019-03-22 | 2019-03-22 | Radio frequency front-end circuit and mobile terminal |
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| WO (1) | WO2020192426A1 (en) |
Families Citing this family (14)
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| CN109861735B (en) * | 2019-03-22 | 2022-07-15 | 维沃移动通信有限公司 | Radio frequency front-end circuit and mobile terminal |
| CN110518932B (en) * | 2019-08-16 | 2022-06-07 | 维沃移动通信有限公司 | Radio frequency front-end circuit and mobile terminal |
| CN110808757A (en) * | 2019-10-29 | 2020-02-18 | Tcl移动通信科技（宁波）有限公司 | Radio frequency front-end circuit and terminal equipment |
| CN110890900A (en) * | 2019-11-29 | 2020-03-17 | 维沃移动通信有限公司 | Radio frequency circuit and electronic equipment |
| CN110943757B (en) * | 2019-11-29 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic equipment |
| CN111181620B (en) * | 2020-01-06 | 2023-04-25 | 维沃移动通信有限公司 | Radio frequency circuit and electronic equipment |
| CN111294081B (en) * | 2020-01-22 | 2022-01-11 | Oppo广东移动通信有限公司 | Radio frequency system and electronic equipment |
| CN111510180B (en) * | 2020-04-23 | 2022-02-01 | 维沃移动通信有限公司 | Antenna module, electronic equipment and control method |
| CN111756388B (en) * | 2020-06-28 | 2022-06-07 | 维沃移动通信有限公司 | Radio frequency circuit and electronic equipment |
| CN112187311B (en) * | 2020-09-27 | 2022-08-09 | Oppo广东移动通信有限公司 | Radio frequency system and communication device |
| CN112397876A (en) * | 2020-11-05 | 2021-02-23 | 深圳市锐尔觅移动通信有限公司 | Antenna module and terminal |
| CN114584168A (en) * | 2020-11-17 | 2022-06-03 | 中国移动通信有限公司研究院 | Signal output device and electronic equipment |
| CN114978201B (en) * | 2021-02-25 | 2024-02-02 | Oppo广东移动通信有限公司 | Radio frequency front end module and electronic equipment |
| CN115694522B (en) * | 2023-01-03 | 2023-05-23 | 荣耀终端有限公司 | Radio frequency module and electronic equipment |
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| WO2020192426A1 (en) | 2020-10-01 |
| CN109861735A (en) | 2019-06-07 |
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