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增益可编程放大器(Programmable gain amplifier)简称PGA,它可以在不同逻辑电平编程的控制下对信号提供不同放大倍数,特别适合用于数据巡回检测器和自动测量仪表。这里介绍的增益可编程放大器可在四种逻辑编程下分别提供1、10、100和1000倍的放大倍数,每种放大倍数下的带宽均大于30kHz,整个电路在±5V电源电下的消耗电流不大于7mA。如图所示,输入信号经IC1a缓冲后送到第一级放大器IC1b。多路转换器IC1(4052)在A、B端输入的逻辑电平控制下切换R5～R8中的一只电阻,使其接入IC1b放
Programmable gain amplifier (PGA), which can provide different magnifications to signals under different logic level programming, is especially suitable for data-path detectors and automatic measuring instruments. The programmable gain amplifier introduced here provides 1, 10, 100 and 1000 times magnification under four kinds of logic programming respectively. The bandwidth under each magnification is greater than 30kHz. The current consumption of the whole circuit under ± 5V power supply Not more than 7mA. As shown, the input signal is buffered by IC1a to the first stage amplifier IC1b. Multiplexer IC1 (4052) in the A, B-side input logic level control switch R5 ~ R8 in a resistance, it access IC1b release