SU836761A1

SU836761A1 - Transistorized amplifier

Info

Publication number: SU836761A1
Application number: SU792776776A
Authority: SU
Inventors: Эмбург Николаевич Торошелидзе; Владимир Михайлович Ватутин
Original assignee: Институт Кибернетики Ан Грузинской Сср
Priority date: 1979-06-07
Filing date: 1979-06-07
Publication date: 1981-06-07

Description

(54) ТРАНЗИСТОРИЬЙ УСИЛИТЕЛЬ(54) TRANSISTOR AMPLIFIER

1one

Изобретение относитс к электронным усилител м и может быть использовано в системах автоматического управлени .This invention relates to electronic amplifiers and can be used in automatic control systems.

Известен транзисторный усилитель, содержащий основной транзистор, первый и второй дополнительные транзисторы , базы которых соединень между собой, а каждый коллектор дополнительного транзистора через резистивную нагрузку соединен с шиной питани , эмиттер первого дополнительного транзистора через резистор соединен с общей шиной Dl«A transistor amplifier containing a main transistor, the first and second additional transistors, the bases of which are interconnected, and each collector of the additional transistor are connected to the power bus through a resistive load, the emitter of the first additional transistor is connected to the common bus Dl through the resistor.

Однако известный транзисторный усилитель не обладает высокой чувствительностью .However, the well-known transistor amplifier does not have high sensitivity.

Цель изобретени - повьшение чувствительности .The purpose of the invention is to increase the sensitivity.

Дп этого в транзисторный усилитель , содержащий основной транзистор , первый и второй дополнительные транзисторы, базы которых соединены между собой, а каждый коллекторDp this in a transistor amplifier containing the main transistor, the first and second additional transistors, the bases of which are interconnected, and each collector

Claims

Additional transistor through a resistive load is connected to the power bus, the emitter of the first additional transistor is connected to a common bus through a resistor, an auxiliary transistor is inserted, the base of which is connected to the emitter of the first, the collector is connected to the emitter of the second additional transistors, and the emitters of the main and auxiliary transistors are connected to a common pin , the base of the main transistor through a resistor, and its collector is directly connected to the base of the first additional transistor, the collector and ba for which are interconnected through a resistor. An input source is connected to the base of the main transistor. In addition, a photodiode is applied as the input source, which is connected by a reverse polarity between the power bus and the base of the main transistor. 3 The drawing shows the circuit diagram of the proposed device. The transistor amplifier contains a main transistor 1, the first and second additional transistors 2 and 3, resistive loads 4 and 5, the first and second additional transistors, 2 and 3 are connected to the power bus 6, a resistor 7, connected between the emitter of the first additional transistor 2 and the common bus 8, the auxiliary transistor 9, the resistors 10 and I1, the photodiode 12. The transistor amplifier operates as follows. In the initial state, due to resistors 7 and 10, the bias currents of the second auxiliary 3 and auxiliary 9 transistors are set equal, the main transistor 1 operates in class A, and the output potential of the amplifier is low in absolute value. When a signal is applied to the electrical input (base of the main transistor I) or when the photodiode 12 converts the light flux into an electrical signal, a current flows through the main transistor & pc of the main transistor 1. Due to the fall of the voltage on the resistive load 4 and resistor 11, additional 2 and 3 and auxiliary 9 transistors are locked, the output of the amplifier increases in absolute value, the first additional 2 and auxiliary 9 transistors are boiled as composite. The total gain of the entire circuit is essentially equal to the product of the gains of each transistor 1, 2, 3, and 9, with the equivalent input resistance of the main transistor 1 decreasing due to parallel connection of additional transistors 2 and 3. The main transistor 1 additional transistors and 3, organizes together with a resistive load 4 and a resistor II a controlled voltage divider. Since the current of this divider is the collector current of the mainHioio transistor I, the very deterioration of the temperature characteristics of the amplifier leads to a corresponding change in the base bias in the second additional 3 and auxiliary 9 transistors. The use of new elements makes it possible to increase the sensitivity of the amplifier without deteriorating its frequency properties when converting short light fluxes into an electrical signal. Claim I. Transistor amplifier containing a main transistor, the first and second additional transistors, the bases of which are interconnected, and each collector of an additional transistor through a resistive load connected to the power bus, the emitter of the first additional transistor through a resistor connected to a common bus, different so that, in order to increase the sensitivity, an auxiliary transistor is introduced, the base of which is connected to the emitter of the first, the collector is connected to the emitter of the second additional transistor The emitters of the main and auxiliary transistors are connected to the common bus, the base of the main transistor is through a resistor, and its collector is directly connected to the base of the first additional transistor, the collector and the base of which are interconnected via a resistor, the source is connected to the base of the transistor. input signal.

2. An amplifier according to claim I, characterized in that a photodiode is used as an input source, which is connected by a reverse polarity between the power line and the main transistor battery. Sources of information, taken into account in the expert evaluation 1. US Patent No. 3.148.337, cl. 330-28, 09/08/64 (prototype).