SU1376230A1 - Transistor power amplifier - Google Patents

Abstract

The invention relates to radio engineering and provides increased efficiency while reducing the unevenness of the frequency x. The transistor power amplifier contains an input quadrature power divider 1, amplifiers 2.3, quadrature adder 4, phase corrector 5, a directional coupler with a weak connection (nose) 6, and ballast resistors 7.8. The amplifiers 2,3 consist of an input harmonic circuit 9, a transistor amplification stage (TCU) 10, an output matching circuit I1. At the upper frequency of the passband, the input power is fully supplied to the JO PTC, amplified and output. When the input signal frequency decreases, a part of the power is reflected from matching 9 circuits and passes through quadrature divider 1, phase corrector 5 and nose 6 to the upstream device va. The introduction of the nose 6 and the phase corrector 5 makes it possible to reduce the power removed from the TCU 10 at low frequencies. 1 il. "M ko f

Description

Bxss p P

sh.

, t

J

Yu

&but

-It

CO od

Yu

with

The invention relates to radio engineering and can be used in transistor radio transmission equipment.

The purpose of the invention is to increase the efficiency while reducing the unevenness of the frequency response.

The drawing shows a functional diagram of the transistor effort-Q power bodies,

The transistor power amplifier contains the input quadrature power divider 1, the first 2 and second 3 amplifiers, quadrature adder A, ts phase corrector 5, directional coupler 6 with weak coupling, first 7 and second 8 ballast resistors, input matching circuit 9, transistor amplification stage IO and output-20 matching circuit 11.

The transistor power amplifier is following the “1; im image

At the upper frequency of the passband, the input power completely enters the inputs of the transistor stages 10, in which the transistor operates in a nonlinear mode, is amplified in them, and is transmitted to the output of the device. When the frequency of the input signal is reduced, a part of the input light is reflected from the matching circuits 9, the third output of the quadrature input divider 1 passes and is transmitted through the phase corrector 5 and the directional, with a coupler with a weak link 6, to the output of the device. Due to this, the gain of the transistor amplifier in the low-frequency region increases, which allows 0 to reduce the power removed from the transistor cascades 10 at these frequencies by selecting the appropriate characteristics of the input matching circuit 9 and, accordingly, increasing the efficiency of the device while maintaining the shape of the frequency specifications.

With increasing efficiency, the non-uniformity of the frequency response of the transistor fading of the input matching circuit 9 decreases in the low-frequency pass-band region and the inequality of its transmission coefficient decreases.

The central frequency of the weakly coupled coupler 6 is equal to half the upper frequency bandwidth to provide a summation of the output power of the front corrector 5 and the quadrature adder 4 in the frequency range where f and f. - respectively, n and the upper limiting frequency of the transducer transistor usi

f

neither

tel power. When with equal to 0.5 f,.

this f choose

Claims (1)

Formula invented A power transistor amplifier containing an input quadrature power driver, the first and second amplifiers, each of which contains a series-connected input matching circuit, a transistor to gain circuit and an output matching circuit, the first and second ballast resistors, with the first ballast resistor connected between the first output the house of the quadrature adder and the common bus, and the first and second amplifiers are connected between the respective paths in the Inputs of the quadrature power div and the inputs of the quadrature sucmator, which is different; that, in order to increase the efficiency while simultaneously reducing the unequal frequency response, a directional coupler with a weak coupling, the input of which is connected to the second output of the quadrature adder, the first output through the second ballast resistor is connected to the busbar, and the second output is output a transistor power amplifier., a phase equalizer connected between the third output of the input quadrature power divider and the second output of a directional coupler with a weak coupling. tel power, because, because of the increase, Compiled by V. Zarschikov Editor O.GolovachTekhred L.Oliyyyk ProofreaderV.But ha Order 797/55 Circulation 928 Subscription VNIISH of the USSR State Committee for Inventions and Discoveries, 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and printing company, Uzhgorod, ul, Proektna, 4 The attenuation of the input matching circuit 9 in the low frequency range of the passband reduces the non-uniformity of its transmission coefficient. The central frequency of the weakly coupled directional coupler 6 is chosen equal to half the upper frequency of the passband to provide the summation of the output power of the phase corrector 5 and the quadrature adder 4 in the frequency range where f and f. - respectively, n and the upper limiting frequency bandwidth of the transistor amplification f -f n b power bottom. When with equal to 0.5 f,. this f chooses Invention Formula A transistor power amplifier containing an input quadrature power divider, the first and second amplifiers, each of which contains a series-connected input matching circuit, a transistor amplification stage and an output matching circuit, the first and second ballast resistors, with the first ballast resistor connected between the first output of the quadrature adder and the common bus, and the first and the second amplifiers are connected between the corresponding outputs of the Input quadrature power divider and the inputs of the quadrature bitches matora about the same; that, in order to increase efficiency while reducing the frequency response unevenness, a weakly coupled directional coupler was introduced, the input of which is connected to the second output of the quadrature adder, the first output through the second ballast resistor is connected to the common bus, ., phase corrector connected between the third output of the input quadrature power divider and the second output of the directional coupler with a weak coupling.