SU1332514A1 - Push-pull power amplifier - Google Patents

Abstract

This invention relates to a signal amplification technique. The purpose of the invention is to reduce the level of nonlinear distortion. The power amplifier (U) contains an input phase-inverse transformer 1, an output push-pull transformer stage 2 containing bipolar transistors 3 and 4 and diodes 5 and 6, differential 7 and 8, and current transformers (TT) 9 and 10. U 7 together with TT 9 , as well as 8, together with the TT 10, respectively, form currents through the diodes 5 and 6, which are proportional to the input voltage. As a result, the load current of the power also with a high degree of accuracy repeats the shape of the input voltage. The goal is achieved by introducing V7i8iTT9i10.1 Il. i Г (Л Input Output Еа II .: .J

Description

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This invention relates to a signal amplification technique and can be used in low frequency power amplifiers.

The purpose of the invention is to reduce the level of non-linear distortions.

The drawing shows a functional diagram of the push-pull amplifier power signal.

The push-pull power amplifier contains an input phase-inverting transformer 1, an output push-pull transformer stage 2, the first 3 and second 4 bipolar transistors, the first 5 and second 6 diodes, the first 7 and second 8 differential amplifiers, the first 9 and second 10 current transformers.

Push-pull power amplifier. works as follows.

The first differential amplifier 7 together with the first current transformer 9 and the second differential amplifier 8 together with the second current transformer 10 generate currents, respectively, through the first 5 and second 6 diodes, which are proportional to the input voltage.

If the volt-ampere characteristic of the first diode 5, built into the case of the first bipolar transistor 3, with a high degree of accuracy is similar to the current-voltage characteristic of the base-emitter junction of the first bipolar transistor 3, and the current-voltage characteristic of the second diode 6, built into the case of the second of a bipolar transistor 4, with a high degree of accuracy, is similar to the current-voltage characteristic of a base-emitter junction of a second bipolar transistor 4, then the load current of a push-pull amplifier with a power editor M. Blancar

Compiled by V.Zarschikov Tehred I.Popovich

Order 3847/54

Circulation 901 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

142

Carry also with a high degree of accuracy repeats the shape of the input voltage.

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Claims (1)

Invention Formula A push-pull power amplifier containing an input phase-inverting transformer and an output push-pull transformer cascade on the first and second bipolar transistors connected in a common emitter circuit, the first and second diodes embedded respectively in the case of the first iv second bipolar transistors whose cathodes are connected to emitters corresponding bipolar transistors, characterized in that, in order to reduce the level of nonlinear distortion of the output signal, the first and second differential amplifiers are introduced, having an unbalanced output, the first and second current transformers, while the output of the first differential amplifier is connected to the base of the first bipolar transistor and through the primary winding of the first current transformer to the anode of the first diode, and the inverting input to the output of the first current transformer, the output of the second differential amplifier connected to the base of the second bipolar transistor and through the primary winding of the second current transformer to the anode of the second diode, and the inverting input to the output of the second transformer t In other words, the non-inverted inputs of the first and second differential amplifiers are connected respectively to the paraphase output of the input phase-inverting transformer. Proofreader A.T. sko