SU1160526A1 - Two-step power amplifier - Google Patents

Abstract

A DUAL-TURNED POWER USITGE, containing the first and second transistors, whose collectors are connected to the common buses (two-stroke terminal and the first wadding power source, an input transformer with two secondary windings and an output transducer, and one output transformer, and one output transformer with two secondary windings and an output transducer and one output power source. power supply, the first terminal of the first secondary winding of the input transformer is connected to the primary terminals of the primary (the output transformer, and, the second terminal is 13). This is connected to the second output of the primary winding of the output transformer, which is based on the fact that, in order to connect it to the CDC, the power source is designed as a power source with a pulsating voltage, the base of the first transistor is average with the second 1 output of the secondary winding of the INPUT transformer, and the base of the second transistor with the first output of the second secondary winding of the input transformer, an amplifier and an additional transformer with a secondary secondary winding, the first output (L of the primary winding of which Through the covdensator, the cable is not connected to the first j and the second output to the second seam of the power source, the first Biffio i secondary windings of the additional transformer are connected to the emitters of the first and second transistors 1a B1ts: fie. pins respectively to the first and second pins of the primary coils of the output transformer. N0

Description

. ;. /; I. , The invention relates to semiconductor amplifiers and can be used in various fields of science and technology as an alternating current amplifier, which ensures linearity of the output characteristics and is high (effective efficiency).

The purpose of the invention is to increase the efficiency of the k6.

FIG. Figure 1 shows a two-stroke hydrofacial circuit. power amplifier j in FIG. 2 plots on his work.

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The push-pull amplifier of the multiplier contains the first 1 and second 2 transistors, the input transformer 3, the additional transformer 4, the supply transformer 5, the source. 6 power and capacitor 7.

Push-pull power amplifier works as follows.

05262

The input signal through the input transformer 3 is supplied to the base junctions of the first 1 and second 2 transistors through the secondary windings of the secondary transformer 4, the output voltage of the power source 6 is a pulsating voltage synchronized with the input voltage (Fig. 2, plots a and b ).

Due to this, the bias voltage at the basic transitions of the first 1 and second 2 transistors changes in time with the input signal (Fig. 2, ECPR, guide), which ensures their automatic transition from the operation mode in class C to class A when entering the base the transition of the corresponding transistor of the input signal with the corresponding phase and provides amplification of the signal with elevated AHC at an acceptable level of nonlinear distortion (Fit. 2, plot e).

Claims (1)

A TWO-STAGE POWER AMPLIFIER, comprising first and second transistors, the collectors of which are connected to a common bus of a push-pull Power amplifier and a first power supply channel, an input transformer with two secondary windings and an output transformer, the middle terminal of which primary winding is connected to the second power supply bus, while the first output of the first secondary winding of the input. the transformer is connected to the first terminal of the primary winding of the Output transformer, and the second terminal of the second- \ '''swarm of the secondary winding is connected to the second terminal of the primary winding of the output transformer ^ characterized in that, in order to increase its QCD, the power source is designed as a power source with pulsating voltage, the base of the first transistor is connected to the second terminal of the first secondary winding of the input transformer, and the base of the second transistor is connected to the first terminal of the second secondary winding of the input transformer, administered condenser and complement _h tional transformer with two secondary windings, a first terminal of the primary winding is through the capacitor connected to the first bus and the second output - to a second power source bus, the first terminals of the secondary windings of the additional transformer is connected to the emitters of the first and second transistors, and the second conclusions, respectively, to the first and second conclusions of the primary winding of the output transformer. > 1 1160526 2