SU1233261A1 - Gate-type power amplifier - Google Patents

Abstract

The invention provides an extension of the dynamic range of the amplified signals. The error signal extraction unit (BVSO) 1 subtracts the output pulse sequence from the input and integrates. On the weight adder 2 pos. the output pulse sequence defining the thresholds of the operation of the comparator 3, the difference signal with BVSO 1 and the sequence of short polarized pulses generated by the generator 5 clock pulses and differentiation unit 6 and the threshold of the comparator triggered by amplitude 3. The operation of the comparator 3 is determined by the instantaneous ratio the amplified signal and the amplitude of the output pulses. The signal generated by the comparator 3 passes through the key amplifier 4 to the output. The key power amplifier works in the mode of adaptive pulse-width modulation with forced synchronization in a wide range of amplitudes of the amplified signals. 1 il. W N5 WITH WITH INO OD

Description

I 1

This invention relates to an amplifier technique and can be used to amplify low frequency voltage in high and medium power devices.

The purpose of the invention is to expand the dynamic range of the amplified signals.

The drawing shows a structural electrical circuit of a key power amplifier.

The device comprises an error signal extraction unit 1, a weight adder 2, a comparator 3, a key amplifier 4. a generator of 5 clock pulses, and a differentiation unit 6.

Key power amplifier works as follows.

Pulses from the output of the key amplifier 4; arrive at the second input of the error signal extraction unit 1, where they are subtracted from the amplified signal and integrated. As a result, the second input of the weight adder 2 receives the difference between the average value of the output pulse sequence of the key amplifier 4 and the amplified signal,

In addition, the pulse sequence from the input of the key amplifier 4 through the weight adder 2 is fed to the input of the comparator 3, determining its thresholds. The generator 5 clock pulses generates a sequence of right angle pulses of the type square wave. At the same time, at the output of the bioco 6 differentiation, a sequence of short polarized impulses is formed, the amplitude of which exceeds the positive and negative thresholds of erasing the comparator 3 generated from the sequence of impulse signals from the output of the key amplifier 4.

At the same time, if the ratio of the instantaneous value of the amplified signal and the aathlititude of the output pulses of key amplifier 4 is less than 0.5, the pulses of negative polarity from the output of differentiation unit 6 result in switching on comparator 3 and, as a result, the beginning of output pulses of key amplifier 4 coincide . gives with moments of appearance at the exit VNIIPI Order 2781/56

and the third entry - with his Circulation 816 Subscription

Production polygr, pr-tie, g, Uzhgorod, st. Project, 4

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33261 .2

unit 6 for differentiating negative polarity pulses.

Output pulses of a positive polarity from the differential-i block

5 do not affect the operation of the comparator 3, since by the time of their occurrence the comparator 3 is already switched off by the equality of the signal from the output of the error signal extraction block 1 to the negative of the comparator 3 response threshold,

As the input signal increases in magnitude to such an extent that the ratio of the instantaneous value to the amplitude of 5 de output pulses of key amplifier 4 is greater than 0.5, the positive polarity pulses from the output of differentiation unit 6 determine the end of key amplifiers 4, and their beginning is determined by the equality of the signal from the output of the selection block: the error signal to the positive threshold of the comparator.

Thus, the proposed key power amplifier operates in an adaptive pulse-width modulation mode with forced synchronization in a fairly wide range of amplitudes of amplified signals, which, by reducing nonlinear distortions due to the forced synchronization mode, makes it possible to amplify signals with an increased dynamic amplitude range,

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Claims (1)

Invention Formula A key power amplifier containing a clock pulse generator and an error signal extraction unit, the first input of which is the input of a slotted power amplifier, as well as a serially connected comparator and a key amplifier whose output is connected to the second input of the error signal selection unit, characterized in that in order to expand the dynamic range of the amplified signals, between 50 by a clock generator output and a comparator input, a series-connected differentiation unit and a weight adder are inputted, the second input of which is connected to the output of the error signal extraction unit, and the third entry is from its second entry. Circulation 816 Subscription thirty Uzhgorod, st. Project, 4