CN216122359U - Power output circuit and radio frequency power amplifier - Google Patents
Power output circuit and radio frequency power amplifier Download PDFInfo
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- CN216122359U CN216122359U CN202122170969.1U CN202122170969U CN216122359U CN 216122359 U CN216122359 U CN 216122359U CN 202122170969 U CN202122170969 U CN 202122170969U CN 216122359 U CN216122359 U CN 216122359U
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Abstract
The utility model discloses a power output circuit and a radio frequency power amplifier, wherein the power output circuit comprises a power amplifier module, an impedance matching module and a harmonic switching module, wherein the power amplifier module is connected with the impedance matching module, the output end of the power amplifier module is connected with a direct current power supply, the impedance matching module is connected with the harmonic switching module, and the power amplifier module is used for amplifying an input radio frequency signal, converting direct current power provided by the direct current power supply into radio frequency power and transmitting the radio frequency power; the impedance matching module is used for matching and outputting the output impedance of the power amplifier module, and the harmonic switching module is used for switching generated harmonics with different frequencies, so that the efficiency of the power amplifier is improved, the harmonics are restrained in a targeted manner, and the linearity of the power amplifier is improved.
Description
Technical Field
The utility model relates to the technical field of wireless communication, in particular to a power output circuit and a radio frequency power amplifier.
Background
In a wireless communication system, a radio frequency power amplifier is a key component for realizing wireless transmission of radio frequency signals, and has the function of converting direct current power provided by a direct current power supply into radio frequency power and transmitting the radio frequency power. The performance of the power amplifier directly affects the communication quality, signal transmission intensity, battery endurance and the like of the system, and the communication system has higher and higher requirements on the power additional efficiency and linearity of the power amplifier.
In an ultrahigh frequency radio frequency system, due to the particularity of the working principle of the system, a power amplifier always keeps working in the whole communication process, so that the influence of the power amplifier is more important, the power amplification efficiency is one of important indexes for measuring the performance of the radio frequency power amplifier, and the definition is as follows: the ratio of the output power of the radio frequency power amplifier to the dc power supplied by the dc power supply. The high-efficiency power amplifier has the advantages of reducing energy consumption in operation, reducing the working temperature of the power amplifier, improving reliability, reducing the requirement on a heat dissipation system and the like.
In the prior art, a separated inductor and a separated capacitor are used as an output matching circuit of a power amplifier, and an integrated low-pass filter is used for filtering out harmonic waves, so that the problems that the bandwidth is not easy to expand, the efficiency is low, the cost is high, and the consistency is not easy to guarantee can be caused.
SUMMERY OF THE UTILITY MODEL
In view of the above technical problems, the present invention provides a power output circuit and a radio frequency power amplifier.
The first aspect of the utility model provides a power output circuit, which comprises a power amplifier module, an impedance matching module and a harmonic switching module, wherein the power amplifier module is connected with the impedance matching module, the output end of the power amplifier module is connected with a direct current power supply, the impedance matching module is connected with the harmonic switching module, and the power amplifier module is used for amplifying an input radio frequency signal, converting direct current power provided by the direct current power supply into radio frequency power and transmitting the radio frequency power; the impedance matching module is used for matching and outputting the output impedance of the power amplifier module, and the harmonic switching module is used for switching generated harmonics with different frequencies.
Optionally, the impedance matching module comprises one or more microstrip lines.
Optionally, if the impedance matching module includes a plurality of microstrip lines, the impedance of each microstrip line is different.
Optionally, the length and width of each microstrip line are different.
Optionally, the harmonic switching module includes a switch, a first capacitor, a first inductor, a second capacitor, and a second inductor, where the first capacitor is connected to the first inductor, the second capacitor is connected to the second inductor, and the switch is connected to the first capacitor and the second capacitor, respectively.
Optionally, the power output circuit further includes a third inductor, and the dc power supply is connected to the output end of the power amplifier module through the third inductor.
Optionally, the impedance matching module includes three microstrip lines, and impedances of the microstrip lines are 11 ohms, 31 ohms and 50 ohms, respectively.
Optionally, the power amplifier module is a power amplifier chip RF 5110G.
The second aspect of the present invention also provides a radio frequency power amplifier, comprising the power output circuit of the first aspect.
The embodiment of the utility model provides a power output circuit and a radio frequency power amplifier, which comprise a power amplifier module, an impedance matching module and a harmonic switching module, wherein the power amplifier module is connected with the impedance matching module, the output end of the power amplifier module is connected with a direct current power supply, the impedance matching module is connected with the harmonic switching module, and the power amplifier module is used for amplifying an input radio frequency signal, converting direct current power provided by the direct current power supply into radio frequency power and transmitting the radio frequency power; the impedance matching module is used for matching and outputting the output impedance of the power amplifier module, and the harmonic switching module is used for switching generated harmonics with different frequencies, so that the efficiency of the power amplifier is improved, the harmonics are restrained in a targeted manner, and the linearity of the power amplifier is improved.
Drawings
FIG. 1 is a schematic diagram of power output circuit connections in an embodiment of the present invention;
FIG. 2 is a schematic diagram of another power output circuit connection in an embodiment of the utility model;
fig. 3 is a schematic diagram of impedance matching according to an embodiment of the utility model.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a power output circuit, including a power amplifier module, an impedance matching module and a harmonic switching module, where the power amplifier module is connected to the impedance matching module, an output end of the power amplifier module is connected to a dc power supply, the impedance matching module is connected to the harmonic switching module, and the power amplifier module is configured to amplify an input radio frequency signal, convert a dc power provided by the dc power supply into a radio frequency power, and transmit the radio frequency power; the impedance matching module is used for matching and outputting the output impedance of the power amplifier module, and the harmonic switching module is used for switching generated harmonics with different frequencies.
Specifically, in the embodiment of the present invention, an impedance matching module is added, where the impedance matching module includes one or more microstrip lines, and a plurality of microstrip lines refers to two or more microstrip lines in the embodiment of the present invention. In a specific implementation process, the number and impedance of the microstrip lines are not specifically limited in the embodiment of the present invention. That is to say, the impedance of each microstrip line is the same, also can be the impedance of each microstrip line is different, and like this, the length or the width of each microstrip line is different to, carry out power amplifier output impedance matching through asymptote mode, can reduce the sudden change of impedance like this, improve the linearity of power amplifier.
Specifically, the harmonic switching module includes a switch, a first capacitor C1, a first inductor L1, a second capacitor C2, and a second inductor L2, where the first capacitor C1 is connected to the first inductor L1, the second capacitor C2 is connected to the second inductor C2, and the switch is connected to the first capacitor C1 and the second capacitor C2, respectively.
Optionally, the power output circuit further includes a third inductor L3, and the dc power supply is connected to the output terminal of the power amplifier module through the third inductor. I.e., L3 is a choke inductor through which power is supplied to the power amplifier chip.
Specifically, as shown in fig. 1, the power output circuit includes a power amplifier chip, a microstrip line 1, a microstrip line 2, a microstrip line 3, and a harmonic suppression switching circuit. The power amplification chip is used for amplifying an input radio frequency signal, converting direct current power provided by a direct current power supply into radio frequency power and transmitting the radio frequency power; microstrip line 1, microstrip line 2, microstrip line 3 is the matching circuit of the power amplifier output, microstrip line 1, 2, 3 difference is that the width is different with length, carry on the power amplifier to export the impedance match through the asymptote way, can reduce the sudden change of the impedance, improve the linearity of the power amplifier; the harmonic suppression switching circuit switches different inductance and capacitance combinations (L1, C1, L2 and C2) through a radio frequency switch to achieve the effect of suppressing different harmonics; l3 is a choke inductor through which power is supplied to the power amplifier chip.
The embodiment of the utility model is suitable for the power amplifier chip which cannot be matched with 50 ohm impedance.
Exemplarily, a power amplifier chip RF5110G is taken as an example, the output impedance of the chip is 2.6-j15, the characteristic impedance of a microstrip line 1 is actually designed to be 11 ohms, the characteristic impedance of a microstrip line 2 is designed to be 31 ohms, and the characteristic impedance of a microstrip line 3 is designed to be 50 ohms, so that the continuity of the impedance is ensured by the sectional design, and the frequency band range is widened; the second and third harmonics can be selectively filtered out by L1, C1 and L2, C2. The frequency range can cover 860MHz-930MHz, and output the second harmonic-23 dBm, as shown in FIG. 3, the W1 frequency is 860MHz, the W2 frequency is 900MHz, and the W3 frequency is 930 MHz. The VSWR is a standing wave ratio equivalent circle (it is sufficient to actually debug the empirical impedance matching to a circle having VSWR of 2.0).
Fig. 2 is a schematic diagram of a connection of another power output circuit in an embodiment of the present invention, and as shown in fig. 2, the power output circuit includes a power amplifier chip, a microstrip line 4, and a harmonic suppression switching circuit. The power amplification chip is used for amplifying an input radio frequency signal, converting direct current power provided by a direct current power supply into radio frequency power and transmitting the radio frequency power; the microstrip line 4 is a matching circuit of power amplifier output, and the impedance matching of the power amplifier output is carried out in an asymptote mode, so that the sudden change of impedance can be reduced, and the linearity of the power amplifier is improved; the harmonic suppression switching circuit switches different inductance and capacitance combinations (L1, C1, L2 and C2) through a radio frequency switch to achieve the effect of suppressing different harmonics; l3 is a choke inductor through which power is supplied to the power amplifier chip.
The technical scheme provided by the embodiment of the utility model has lower cost, and can widen the frequency range and improve the power amplification efficiency. The harmonic suppression system can be dynamically adjusted according to different frequency points, namely, different LC paths are switched through the change-over switch, different harmonics are suppressed through different LC resonant frequencies, so that the dynamic adjustment of the harmonic suppression system can be achieved, and the practical application is flexible. The implementation mode is simple, the applicability is strong, and the method can be used for all RFID readers.
The embodiment of the utility model also provides a radio frequency power amplifier which comprises the power output circuit.
The embodiment of the utility model provides a power output circuit and a radio frequency power amplifier, which comprise a power amplifier module, an impedance matching module and a harmonic switching module, wherein the power amplifier module is connected with the impedance matching module, the output end of the power amplifier module is connected with a direct current power supply, the impedance matching module is connected with the harmonic switching module, and the power amplifier module is used for amplifying an input radio frequency signal, converting direct current power provided by the direct current power supply into radio frequency power and transmitting the radio frequency power; the impedance matching module is used for matching and outputting the output impedance of the power amplifier module, and the harmonic switching module is used for switching generated harmonics with different frequencies, so that the efficiency of the power amplifier is improved, the harmonics are restrained in a targeted manner, and the linearity of the power amplifier is improved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A power output circuit is characterized by comprising a power amplifier module, an impedance matching module and a harmonic switching module, wherein the power amplifier module is connected with the impedance matching module, the output end of the power amplifier module is connected with a direct current power supply, the impedance matching module is connected with the harmonic switching module, and the power amplifier module is used for amplifying an input radio frequency signal, converting direct current power provided by the direct current power supply into radio frequency power and transmitting the radio frequency power; the impedance matching module is used for matching and outputting the output impedance of the power amplifier module, and the harmonic switching module is used for switching generated harmonics with different frequencies.
2. The power output circuit of claim 1, wherein the impedance matching module comprises one or more microstrip lines.
3. The power output circuit of claim 2, wherein if the impedance matching module comprises a plurality of microstrip lines, the impedance of each microstrip line is different.
4. The power output circuit of claim 3, wherein the length and width of each microstrip line are different.
5. The power output circuit of claim 2, wherein if the impedance matching module comprises a plurality of microstrip lines, the impedance of each microstrip line is the same.
6. The power output circuit of claim 1, wherein the harmonic switching module comprises a switch, a first capacitor, a first inductor, a second capacitor, and a second inductor, wherein the first capacitor is connected to the first inductor, the second capacitor is connected to the second inductor, and the switch is connected to the first capacitor and the second capacitor, respectively.
7. The power output circuit of claim 1, further comprising a third inductor, wherein the dc power source is connected to the output terminal of the power amplifier module through the third inductor.
8. The power output circuit of claim 3, wherein the impedance matching module comprises three microstrip lines having impedances of 11 ohms, 31 ohms, and 50 ohms, respectively.
9. The power output circuit of claim 1, wherein the power amplifier module is a power amplifier chip RF 5110G.
10. A radio frequency power amplifier comprising a power output circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122170969.1U CN216122359U (en) | 2021-09-09 | 2021-09-09 | Power output circuit and radio frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122170969.1U CN216122359U (en) | 2021-09-09 | 2021-09-09 | Power output circuit and radio frequency power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216122359U true CN216122359U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122170969.1U Active CN216122359U (en) | 2021-09-09 | 2021-09-09 | Power output circuit and radio frequency power amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN216122359U (en) |
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2021
- 2021-09-09 CN CN202122170969.1U patent/CN216122359U/en active Active
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Effective date of registration: 20240814 Address after: 518000 15A, Block D, Central Avenue, intersection of Xixiang Avenue and Baoyuan Road, Labor Community, Xixiang Street, Bao'an District, Shenzhen, Guangdong Province Patentee after: SHENZHEN YINGDA INFORMATION TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 518000 626, block a, Huafeng Internet Creative Park, 107 Gonghe Industrial Road, Longteng community, Xixiang street, Bao'an District, Shenzhen, Guangdong Patentee before: SHENZHEN VBOTO ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region before: China |
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