SU1522377A1 - Broadband amplifying device - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to reduce the level of nonlinear distortion. The device contains a power amplifier 1, phase shifters 2, 3, 6 and 7, amplifiers 4 and 5, adders 8 and 22, bridge adders 9, 10 and 11, controlled voltage dividers 12, 13, 14 and 15, synchronous detectors 16, 17, 18 and 19, delay lines 20 and 21, directional coupler 23 and frequency multipliers 24 and 25. The device uses two automatic control circuits, one of which minimizes the level of the first harmonic at the output of the adder 11, and the other minimizes the level of the K-th harmonic at the output of the adder 11 and at the output of the entire device. The goal is achieved by the operation of the auto-adjusting circuit, which reduces the level of non-linear distortion by the Kth harmonic of the input signal. 1 il.

Description

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The invention relates to radio engineering and can be used as a power amplifier for communication or television transmitters.

The purpose of the invention is to reduce the level of nonlinear distortion,

The drawing shows a structural electrical circuit of a broadband amplifying device.

The broadband amplifying device contains an input amplifier I power, the first 2 and second 3 input phase shifters, the first 4 and second .5 amplifiers, the first 6 and second 7 output phase shifters, the adder 8, the first 9, the second 10 and the third} 1 bridge adders, the first 12 , Vtor.13, the third 14 and the fourth 15 controlled voltage dividers, the first 16, the second

swarm 17, third 18 and fourth 19 synchronous detectors, first 20 and second 21 delay lines, additional adder 22, output directional

coupler 23, first 24 and second 2525 minimum. In general, the output pen

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Kick the input signal from the first and second multipliers 24, 25 frequencies, and the second inputs receive a signal from the output of the third bridge adder 1I. The signals at the output of the first and second synchronous detectors 16, 19 are proportional to the product of the amplitudes of the signals arriving at their inputs by the cosine of the angle between them. Thus, the control action will be equal to zero with appropriate phasing of the input signals of the first and second synchronous detectors 16, 19 only if the output harmonic of the device does not have K-harmonics of the fundamental frequency. Therefore, the proposed automatic control system thus tends to change the amplitude and phase of the signal of the second gain channel so that the level of the K-th harmonic at the output of the entire device and at the output of the third bridge adder 11 would be mini

frequency multipliers.

Broadband amplifying device operates as follows.

The input signal in the inlet divider 1 is divided into two parts, which are fed into two amplifying: channels. After passing the first and second input phase shifters 2 and 3, the signals acquire a phase shift (where N is the number of binary factors in the expansion of the number K-1 into factors, K is the number of the suppressed harmonic) with respect to each other and fed to the inputs of the first bridge adder 9 , Perviy bridge adder 9 implemented

It is a vector addition and subtraction of signals arriving at its inputs, therefore its outputs will be signals shifted by ± 45 relative to the signal at the output of the second input phase switch, left 13, are fed to the inputs of the third and terminal 3. The thus obtained fourth control dividers 14,

 minimizing the level of the first harmonic at the output of the third bridge cooler 11. For this, the signals from the outputs of the first bridge adder 9, delayed in phase in the first and second delay lines 20, 21, by an amount equal to the phase delay of the signal in the second amplifying channel, adder 8 and output directional branch off

after passing through the second and third controlled dividers 13 and 14, where their amplitudes are adjusted, they are fed to the inputs of the additional adder 22, from the output of which to the input of the second amplifier 5. The attenuation control of the controlled second and third dividers 13, 14 is carried out output DC signals, respectively, coming from the outputs of the first and second synchronous detectors 16, 19, the first inputs of which are fed to

13, are fed to the inputs of the third and fourth control dividers 14,

In addition to the Kth harmonic of the input signal, the first and second frequency multipliers 24, 25 may also contain a first harmonization, the presence of which at the first inputs of the first and second synchronous detectors 16, 19 may significantly affect the control law. In order to eliminate this effect, the proposed device uses the second I. f automatic control circuit,

 minimizing the level of the first harmonic at the output of the third bridge adder 11. For this, signals from the outputs of the first bridge adder 9 delayed in phase in the first and second delay lines 20, 21 by an amount equal to the phase delay of the signal in the second amplifying channel adder 8 and the output directional junction 16 and the first inputs of the second and third synchronous detectors 17, 18, which control the signal that compensates for the first harmonic in the third bridge adder 11.

The level of non-linear distortions in the proposed device is reduced compared to the known device due to the operation of the auto-adjustment ring, which improves the level of non-linear distortions, according to the Kth harmonic of the input signal.

Phg. Formula of Invention

Broadband amplifying device containing serially connected input power divider, first input phase shifter, first amplifier, first output phase shifter and power adder, second input phase shifter, the input of which is connected to the second output input-

power splitter, a second amplifier and a second output phase shifter connected in series, the output of which is connected to the second input of the power adder, is different in order to reduce the level of nonlinear distortion,

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An output directional coupler is connected in series, the first bridge adder, the first pack, is the equivalent voltage divider and the additional accumulator, the second control voltage divider connected between the second pin of the first bridge adder and the second input of the additional an adder, the output of which is connected to the input of the second amplifier, the first delay lines connected in series, the first synchronous detector, the third control voltage divider, the second bridge adder, the third bridge accumulator op and second synchronous detector, output

which is connected to the control input of the second controlled voltage divider, the first frequency multiplier, the input of which is connected to the input of the first controlled voltage divider and the input of the first delay line and the output connected to the second input of the second synchronous detector, serially connected to the second delay line , the third synchronous detector and the fourth controlled voltage divider, the output of which is connected to the second input of the second bridge adder, and the second input is connected to the output of the second delay line, the second frequency multiplier and the fourth synchronous detector are connected, the input of the second frequency multiplier is connected to the first output of the first bridge adder and the input of the second delay line, the output of the fourth synchronous detector is connected to the control input of the first controlled voltage divider, and the second input is connected to the second inputs the second and third synchronous detectors and the output of the fourth bridge adder, the second input of which is connected to the first output of the output directional coupler, the output of the output th directional response is connected to the output of the adder.

Claims (1)

Claim A broadband amplifier device comprising a serially connected input power divider, a first input phase shifter, a first amplifier, a first output phase shifter and a power combiner, a second input phase shifter, the input of which is connected to a second output of an input-ed power divider, serially connected to a second amplifier and a second output phase shifter , the output of which is connected to the second input of the power adder, distinguished by the fact that, in order to reduce the level of nonlinear distortion, the output oh directional coupler, the first bridge adder connected in series, the first unitary enterprise - 20 equalizable voltage divider and additional adder, the second controllable voltage divider connected between the second output of the first bridge adder and the second input of the additional 25 adder, the output of which is connected to the input of the second amplifier serially connected the first delay line, the first synchronous detector, the third controlled voltage divider, the second bridge adder, the third bridge adder and the second si a synchronous detector, the output of which is connected to the control input of the second controlled voltage divider, the first frequency multiplier, the input of which is connected to the input of the first controlled voltage divider and the input of the first delay line, and the output is connected to the second input. the second synchronous detector, the second delay line connected in series, the third synchronous detector and the fourth controllable voltage divider, the output of which is connected to the second input of the second bridge adder, and the second input is connected to the output of the second delay line, the second frequency multiplier and the fourth synchronous detector are connected in series, the input of the second frequency multiplier is connected to the first output of the first bridge adder and the input of the second delay line, the output of the fourth synchronous detector ene with a control input of the first voltage divider managed, and a second input coupled to the second inputs of the second and third synchronous detectors, and the output of the fourth adder bridge, a second input coupled to the first output of the output of the directional coupler, the input of the output directional coupler connected to the output of the adder.