SU890542A2

SU890542A2 - Current amplifier

Info

Publication number: SU890542A2
Application number: SU802879784A
Authority: SU
Inventors: Владимир Ильич Турченков
Original assignee: За витель
Priority date: 1980-01-31
Filing date: 1980-01-31
Publication date: 1981-12-15

Description

Изобретение относится к автоматике и радиотехнике.The invention relates to automation and radio engineering.

По основному авт.св. № 351298 известен усилитель тока, содержащий _ транзистор, включенный по схеме с общей базой, источники тока в цепях коллектора и эмиттера и цепь нелинейной обратной связи между цепями эмиттера и коллектора, а источник .θ управляющего тока включен в цепь коллектора [11.By main auto No. 351298, a current amplifier is known that contains a _ transistor connected according to a common base circuit, current sources in the collector and emitter circuits, and a nonlinear feedback circuit between the emitter and collector circuits, and the control current source .θ is included in the collector circuit [11.

Недостатком известного устройства является отсутствие ограничения насыщения с транзистора при малых входных токах. 15A disadvantage of the known device is the lack of saturation restrictions from the transistor at low input currents. fifteen

Цель изобретения - уменьшение степени насыщения.The purpose of the invention is to reduce the degree of saturation.

Для’достижения поставленной цели, в усилитель тока введен дополнительный транзистор другого типа проводи- 20 мости, база и коллектор которого соединены соответственно с базой и эмиттером основного транзистора, а · эмиттер подключен к общей шине.To achieve this goal, an additional transistor of a different type of conductivity is introduced into the current amplifier, the base and collector of which are connected to the base and emitter of the main transistor, respectively, and the emitter is connected to a common bus.

На чертеже приведена схема пред- “ лагаемого устройства.The drawing shows a diagram of the proposed device.

Устройство включает основной транзистор 1, источник 2 тока, шина 3 источника входного тока, элемент 4 обратной связи, например базо-эмит- 30 терний переход следующего транзистора, дополнительный транзистор 5 и' диоды.The device includes a main transistor 1, a current source 2, a bus 3 of an input current source, a feedback element 4, for example a base-emitter-30 th transition of the next transistor, an additional transistor 5 and diodes.

Устройство работает следующим образом.The device operates as follows.

Когда ток от входной шины становится меньше тока от источника 2, то разность этих токов начнет протекать через базы транзисторов 1 и 5, вследствие чего часть тока от источника 2 протекает через коллектор транзистора 5, уменьшая тем самым как степень насыщения транзистора 1, так и ток через него, а следовательно, и расход мощности на основном транзисторе.When the current from the input bus becomes less than the current from source 2, the difference between these currents will begin to flow through the bases of transistors 1 and 5, as a result of which part of the current from source 2 flows through the collector of transistor 5, thereby reducing both the degree of saturation of transistor 1 and the current through it, and therefore the power consumption on the main transistor.

Claims

This invention relates to automation and radio engineering. According to the main auth. No. 351298 a current amplifier is known, comprising a transistor, on {common to a common base circuit, current sources in the collector and emitter circuits and a nonlinear feedback circuit between the emitter and collector circuits, and the control current source is included in the collector circuit 1 . A disadvantage of the known device is the lack of saturation of the transistor at low input currents. The purpose of the invention is to reduce the degree of saturation. To achieve this goal, an additional transistor of a different type of conductivity is introduced into the current amplifier, the base and collector of which are connected respectively to the base and the emitter of the main transistor, and the emitter is connected to the common bus. The drawing is a diagram of the proposed device. The device includes a main transistor 1, a current source 2, an input current source bus 3, a feedback element 4, for example, a base-emit transition of the next transistor, an additional transistor 5 and diodes. The device works as follows. When the current from the input bus becomes less than the current from source 2, the difference between these currents begins to flow through the bases of transistors 1 and 5, as a result of which part of the current from source 2 flows through the collector of transistor 5, thereby reducing both the degree of saturation of transistor 1 and current through it, and hence the power consumption of the main transistor. Claims of the Invention: Current Amplifier according to auth.St. 351298, characterized in that, in order to reduce the degree of saturation, an additional transistor of a different type of conductor is introduced, the base and collector of which is connected respectively to the base and emitter of the main transistor, and the emitter is connected to a common bus. Sources of information taken into account in the examination 1. USSR Author's Certificate O 351298, cl. H 03 F 3/04, 1967.