SU1363434A1 - Amplifier - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to simplify the amplifier. The amplifier contains a transistor 1, a transformer 2, one of the windings of which is completed with a tap 3, a resistive voltage divider 4, separation capacitors 5 and 6 and a blocking capacitor 7. The signal from the amplifier input is fed through a capacitor 5 to tap 3 of the transformer 2 and amplified by the voltage goes to the base of transistor 1. Since Since transistor 1 is connected in a circuit with a common collector, the voltage of the signal removed from its emitter is equal to the voltage at its base and the output signal of the amplifier is added from the emitter voltage of transistor 1 and from the voltage on another winding of the transformer 2. The goal is reached due to the absence of high-frequency choke. 1 il. with ate: about Si 1: 0 with 4

Description

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This invention relates to radio engineering and can be used as a broadband amplifier in coordinated signal transmission paths.

The purpose of the invention is to simplify the amplifier.

The drawing shows a circuit diagram of the proposed amplifier.

The amplifier contains a transistor 1, a transformer 2, one of the windings of which is made with a tap 3, a resistive voltage divider 4, the first and second coupling capacitors 5 and 6, the blocking capacitor 7.

The amplifier works as follows.

The signal from the amplifier input through the first coupling capacitor 5 is fed to the tap 3 of the winding of the transformer 2, made with the tap. The first part of this winding between its beginning and the tap has the number of turns w, the other part - w. The other winding of the transformer 2 has the number of turns W.J. Signal arriving at trans base

of the resistor 1, by the voltage is greater than the input signal by (1 + n,) times, where n, w, / wj. The voltage of the signal removed from the emitter of transistor 1 is equal to the voltage on the basis of this transistor, since it is connected in accordance with a common collector circuit. The signal at the output of the amplifier is added up from the voltage on the emitter and on the other winding of the trans-r: formatter 2.

As a result, the gain of the voltage of the amplifier is

K, Np ,,,

where n, wj / w2

The amplifier current gain is determined by the magnitude

TO; G1 / PA

Editor I. Segl Nick

Compiled by V.Serov Tehred M.Hodanich

Order 6378/52 Circulation 900 Subscription

VNIIPI USSR State Committee

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

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

Input and output impedances are equal

.)

2v, in Z, (Un, + n.) N

3

where Z,

and

ZH signal source and load resistance. In the amplifier path with the characteristic impedance Z, the input and output impedances of the amplifier will be equal to ZQ, if the condition

1G

P.

l- (H-nj) n ,,.

In comparison with the known device in the proposed there is no high-frequency choke.

Claims (1)

Invention Formula An amplifier comprising a transistor, a transformer, one of whose windings is made with a tap, a resistive voltage divider, first and second coupling capacitors and a blocking capacitor, the resistive voltage divider connected between the power supply bus and the common bus, the blocking capacitor is turned on between the tap of the resistive voltage and the common bus, the first cover of the first separator A capacitor is an input, and the second plate of the second coupling capacitor is an amplifier output, characterized in that, for the sake of simplicity, the transistor is connected according to a common collector circuit, the start of the winding, made with a tap, is connected to a tap of a resistive voltage divider , its end is to the base of the transistor, and the lead to the second plate of the first coupling capacitor, the beginning of the other winding is connected to the emitter of the transistor, and the end is connected to the first plate of the second coupling capacitor. Proofreader A. Obruchar