Filter switching arrangement for a tuner

Details Filter switching arrangement for a tuner Filter switching arrangement for a tuner

1988-02-26

1990-02-27

Orsino, Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455340, 3581911, H04B 1116

Patent

active

049053060

ABSTRACT:
In a tunable filter including first and second inductors, a varactor diode, and a bandswitching diode connected intermediate the inductors to select the inductor configuration for first and second tuning bands, a capacitor is connected in parallel with the bandswitching diode. When the bandswitching diode is in the high impedance "non-conducting" state, the capacitor is functionally connected with other elements of the tunable filter for purposes such as trapping or tracking. When the bandswitching diode is in the low impedance "non-conducting" state, the capacitance is functionally disconnected from the tunable circuit.

REFERENCES:
patent: 4023106 (1977-05-01), Utsunomiya
patent: 4379269 (1983-04-01), Ijichi
patent: 4461038 (1984-07-01), Miyoshi
patent: 4703286 (1987-10-01), Muterspaugh
patent: 4771332 (1988-09-01), Metoki
"RCA Color Television Basic Service Data", 1987 CTC-140, Copyright 1987, pp. 2-17.
Schematic for the Matsushita ET17YP Tuner.

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