The system has good performance of variable polarity output, they also have a hardware circuit structure is simple, low cost, the system efficiency.
该系统在具有良好的变极性输出性能的同时，又具有硬件电路结构简单、成本低、系统效率高等优点。
2
A variable gain AC amplifier is coupled to the detector circuit for amplifying the detector output.
一种可变增益AC放大器被连到检波器电路，用于将检波器输出放大。
3
This paper describes the design of a variable impedance output buffer, and its adaptive control circuit. It can automatically adjust the impedance of output buffer in real-time.