RU2008131337A

RU2008131337A - DIFFERENTIAL AMPLIFIER WITH CONTROLLED AMPLIFICATION COEFFICIENT

Info

Publication number: RU2008131337A
Application number: RU2008131337/09A
Authority: RU
Inventors: Николай Николаевич Прокопенко (RU); Николай Николаевич Прокопенко; Даниил Николаевич Конев (RU); Даниил Николаевич Конев; Петр Сергеевич Будяков (RU); Петр Сергеевич Будяков
Priority date: 2008-07-29
Filing date: 2008-07-29
Publication date: 2010-02-10
Also published as: RU2384935C1

Abstract

Дифференциальный усилитель с управляемым коэффициентом усиления, содержащий первый (1) и второй (2) входные транзисторы параллельно-балансного каскада, эмиттеры которых соединены с токовым входом (3) параллельно-балансного каскада, базы соединены с соответствующими первым (4) и вторым (5) основными входами дифференциального усилителя, а коллекторы связаны с первым (6) и вторым (7) выходами дифференциального усилителя и цепью нагрузки (8), первый (9) и второй (10) транзисторы цепи управления усилением, базы которых подключены к управляющему входу (11) дифференциального усилителя, эмиттеры связаны с первым (12) источником опорного тока, а коллекторы связаны с первым (6) и вторым (7) выходами дифференциального усилителя, отличающийся тем, что в схему введены дополнительный резистор (13) и дополнительный источник опорного тока (14), причем дополнительный резистор (13) включен между объединенными эмиттерами первого (9) и второго (10) транзисторов цепи управления усилением и токовым входом (3) параллельно-балансного каскада, к которому подключен дополнительный источник опорного тока (14).A differential amplifier with a controlled gain, containing the first (1) and second (2) input transistors of the parallel-balanced cascade, the emitters of which are connected to the current input (3) of the parallel-balanced cascade, the bases are connected to the corresponding first (4) and second (5 ) the main inputs of the differential amplifier, and the collectors are connected to the first (6) and second (7) outputs of the differential amplifier and the load circuit (8), the first (9) and second (10) transistors of the gain control circuit, the bases of which are connected to the control input ( eleven) differential amplifier, emitters are connected to the first (12) reference current source, and collectors are connected to the first (6) and second (7) outputs of the differential amplifier, characterized in that an additional resistor (13) and an additional reference current source (14) are introduced into the circuit ), and an additional resistor (13) is connected between the combined emitters of the first (9) and second (10) transistors of the gain control circuit and the current input (3) of a parallel-balanced cascade to which an additional reference current source is connected (14).

Claims

A differential amplifier with a controlled gain, containing the first (1) and second (2) input transistors of the parallel-balanced cascade, the emitters of which are connected to the current input (3) of the parallel-balanced cascade, the bases are connected to the corresponding first (4) and second (5 ) the main inputs of the differential amplifier, and the collectors are connected to the first (6) and second (7) outputs of the differential amplifier and the load circuit (8), the first (9) and second (10) transistors of the gain control circuit, the bases of which are connected to the control input ( eleven) differential amplifier, emitters are connected to the first (12) reference current source, and collectors are connected to the first (6) and second (7) outputs of the differential amplifier, characterized in that an additional resistor (13) and an additional reference current source (14) are introduced into the circuit ), and an additional resistor (13) is connected between the combined emitters of the first (9) and second (10) transistors of the gain control circuit and the current input (3) of a parallel-balanced cascade to which an additional reference current source is connected (14).