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介绍一种通过数字信号控制的增益为＋1、－1放大器的电路组成及工作原理并给出了该电路在锁定放大器、自动增益控制及提高D／A转换分辨率、绝对值电路等场合中的实际应用。
This paper introduces the circuit composition and working principle of a gain controlled by digital signal for + 1, -1 amplifier and gives the circuit in the lock-in amplifier, automatic gain control and improve the D / A conversion resolution, absolute value circuit and other occasions Practical application.