Tunable lowpass-highpass switching filter

摘要

A filter is used for multichannel communication receiver, e, g, a CATV converter, which is electronically switched for a lowpass or highpass configuration by switching diodes, and the rejection bandwidth is further controlled by varactor diodes depending on the receiving channel frequency. This reduces the modulation distortions such as composite second and third order inter-modulation and cross-modulation by limiting the number of channels processed by the receiver.