Filter circuit

Details Filter circuit Filter circuit

1980-05-08

1982-04-06

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333191, 333192, H03H 952, H03H 956, H03H 960

Patent

active

043238661

ABSTRACT:
A first three-terminal type ceramic filter is connected to receive an intermediate frequency signal at the input electrode thereof. A first capacitor is connected between the output electrode of the first three-terminal type ceramic filter and the input electrode of a second three-terminal type ceramic filter while the common electrodes of both filters are connected to ground. A second capacitor can be selectively connected in parallel with the first capacitor to within the passband. When the second capacitor is so connected, an inductor is simultaneously connected between the input terminal of the second ceramic filter and ground to offset the passband central-frequency shift caused by connection of the second capacitor. A transistor is preferably used as a switching element to connect the second capacitor and the inductor.

REFERENCES:
patent: 3956719 (1976-05-01), Waku et al.

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