Electrically-tunable, multi-circuit band-pass filter for signal spectrum band filtering in telecommunications systems, has capacitance diodes mutually parallel connected in reverse direction

摘要

An electrically-tunable, multi-circuit band-pass filter, has at least two filter circuits connected behind one another and inter-coupled via a coupling network for providing capacitive current coupling. The band-pass filter has several capacitance diodes (10b) mutually parallel connected in the reverse direction and, on the one hand, connected to ground, and on the other hand the control voltage (V-tune) is taken to the ground diode (10b).