SU1688373A1 - The swept-double frequency generator - Google Patents

Abstract

This invention relates to a radio measuring technique and can be used in panoramic meters of S-parameters of microwave circuits. The purpose of the invention is to expand the frequency range and increase isolation between outputs. The two-frequency oscillating frequency generator contains fixed-frequency oscillators 1, 5, band-pass filters 2, 6. 11, 12. 14, 16, 18, 20. mixers 3 7, filters 4. 8 low frequencies, frequency tunable generator 9 divider 10 signals, multipliers 13, 15, 17, 19 frequencies by two. The multipliers 13. 15 and bandpass filters 2, 11, having a high isolation in the reverse direction, eliminate the effect of frequency clamping between oscillators 9 and 1, thereby expanding the frequency range. Due to the large isolation in the opposite direction of the multipliers 15 and 17, an increase in the isolation between the outputs 1 or 3

Description

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WITH

This invention relates to a radio metering technique and can be used in panoramic meters of S-parameters of microwave circuits.

The aim of the invention is to expand the frequency range and increase isolation between the outputs.

The drawing shows a block diagram of a dual-frequency oscillating frequency generator

Dual-frequency oscillating frequency generator (DO contains the first fixed-frequency oscillator 1, band-pass filter 2, mixer 3 and low-pass filter 4, second fixed-frequency generator 5, band-pass filter 6, mixer 7, low-pass filter 8, tunable frequency generator 9, divider 10 signals, the third band-pass filter 11, the fourth band-pass filter 12, the first frequency multiplier J3

by two. the fifth band-pass filter 14, the second multiplier 15 frequency by two, the sixth band-pass filter 16, the third multiplier 17 frequency by two, the seventh band-pass filter 18, the fourth multiplier 19 frequency by two, the eighth band-pass filter 20

The dual frequency oscillating frequency generator operates as follows.

The signal of the first generator 1 with a frequency of 1-ph1 through the first band-pass filter 2, the multiplier 13 and the fifth band-pass filter 14 enters the input of the first mixer 3, to the second input of which is fed a signal of the generator 9 with the frequency fi-pch passing through the divider 10, the third band filter 11, the second multiplier 15 and the sixth band-pass filter 16. At the same time, at the output of the first mixer 3, a spectrum is formed that has a component of the frequency rz 2tGpch - 2tgfch1, which is extracted by the first filter 00 00

with V4

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rum 4 and is fed to the first output of the two-frequency oscillating frequency generator. Similarly, at the second output of the two-frequency oscillating frequency generator, a signal is generated with the frequency fr tgpch - tgf42, where ft2 is the frequency of the second generator 5. The frequencies tgfch1 and tgfch2 are selected from the relation tgfch2 - tgfch1 0.5tpch, where tpch is the intermediate frequency, which is supported constant with the help of, for example, the FAP 4 system.

By introducing the first and second multipliers 13, 15, and the first and third band-pass filters 2, 11, which are highly isolated in the opposite direction, the effect of frequency tightening between oscillators 9 and 1 is eliminated, thereby expanding the frequency range.

In addition, the signal 2gfc1 through the first mixer 3 does not arrive at the output of the generator 9 and the input of the second mixer 7, since the second multiplier 15 has a large reverse in the opposite direction. Similarly, the signal through the second mixer 7 does not arrive at the output of the generator 9 and the input of the first mixer, since the third multiplier 17 has a large isolation in the opposite direction. In this case, an increase in isolation between the outputs is achieved.

Claims (1)

Invention Formula A two-frequency oscillating frequency generator, containing a series of first fixed frequency generator and a first bandpass filter, a second fixed frequency generator and a second bandpass filter, a tunable frequency generator, a signal divider and a third bandpass filter, which are serially connected in series the first mixer and the first low-pass filter, the output of which is the first output, a two-frequency oscillator of the oscillating frequency, the serially connected second mixer and the second a low-pass filter, the output of which is the second output of a two-frequency oscillating frequency generator, as well as a fourth band-pass filter connected to the second output of a signal divider, characterized in that, in order to expand the frequency range and increase isolation between the outputs, the output of the first bandpass filter is connected to the first input of the first mixer through the two and fifth bandpass filters injected in series with the first frequency multiplier, the output of the third band filter is connected to the second input the first mixer through the serially connected second frequency multiplier to the two and sixth band-pass filter, the output of the fourth band-pass filter is connected to the first input of the second The first mixer is connected through the third frequency multiplier to the two and seventh bandpass filters injected in series, and the output of the second bandpass filter is connected to the second input of the second mixer through the fourth frequency multipliers to the two and eighth bandpass filters injected in series.