一种采用有源低通滤波器的闭环自动增益控制系统

A KIND OF CLOSE LOOP AGC SYSTEM WITH ACTIVE LOWPASS FILTER

提出一种在控制电路中采用一阶有源ＲＣ低通滤波器的闭环ＡＧＣ，并对延迟和无延迟两种型式均研究了响应特性、过渡特性、压缩动态范围的能力和反调制失真情况．通过与其它ＡＧＣ的比较，证明了有源ＡＧＣ动态范围压缩系数最优，非常接近理想ＡＧＣ的指标，而且反调制失真可以小于其它ＡＧＣ．

A brand new close loop AGC system with active first order RC lowpass filter is proposed. This system is divided into two types:the delayed and the nondelayed.Its response feature,transient feature,ability of compressing dynamic range,and condition of antimodulation distortion are studied.By comparising with other kinds of AGC systems,the conclusions are made as follows:Its parameter of compressing dynamic range is the biggestone of all others,and this technical data is close to the data in ideal AGC system;Its antimodulation distortion can be less than those of the others.