同步调谐可变带通滤波器的设计

Design of the synchronously tuned variable band-pass filter

中心频率固定而带宽变化的可变带通滤波器广泛应用在许多电子测量仪器中,本文首先介绍了可变带通滤波器的实现背景,并着重介绍了可利用同步调谐滤波器来实现这种滤波器的理论依据和实际电路。通过电路分析和数学推导可以证明,电路中采用幅度补偿是可行的,并具有优势。

A filter with a stable center frequency and a variable bandwidth has been used in many electronic measurement instruments. Firstly, this paper introduced the background of the variable-bandwidth filter, and then by analyzing the theory of the filter and the circuit used for the practice, many discussions about how to implement the filter with the synchronously tuned filter were presented. After circuit analyzing and mathematics formula discursion, several advantages of using an amplitude compensable circuit are validated.