一种频控带通滤波器的原理与实现杨晓辉，周洪利，吴景棠（北方交通大学北京）在通信、自控、信号处理等领域，往往需要一种特性可控的滤波器。即用一个变化的频率或电压来控制滤波器的中心频率，但要求带宽不变。压控滤波器如不用锁相技术，控制精度很难保证，且使用锁相... Principle and Implementation of a Frequency Control Bandpass Filter YANG Xiao-Hui, ZHOU Hong-Li, WU Jing-Tang (North Jiaotong University, Beijing) In the fields of communication, automatic control and signal processing, a filter with controlled characteristics is often required. That is to use a variable frequency or voltage to control the center frequency of the filter, but requires the same bandwidth. Voltage-controlled filter without phase-locked technology, control accuracy is difficult to guarantee, and the use of phase-locked ...