分析了程控放大器的基本原理和用它对模拟信号进行稳幅和稳零的方法,并定量分析了程控信号的可调节范围及精度。讨论了程控放大器的应用范围。-Analysis of the basic principles of program-controlled amplifier and the use of its analog signal for steady-zero rate and method, and quantitative analysis of the program signals can regulate the scope and accuracy. Discussed the scope of the application of program-controlled amplifier.