Tuning circuit apparatus

Details Tuning circuit apparatus Tuning circuit apparatus

1986-02-21

1987-10-27

Gensler, Paul

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

455179, H03J 318

Patent

active

047032928

ABSTRACT:
In a tuning circuit apparatus comprising first and second tuning circuits having their tuning frequencies varied in a ganged fashion; a composite varactor device provides first and second Varicap diodes formed on a common semiconductor substrate, with anodes of the first and second Varicap diodes being led out to respective independent terminals and cathodes of the Varicap diodes being led out to a common terminal, first and second tuning coils are connected at first ends thereof to the independent terminals associated with the first and second Varicap diodes, respectively, first and second by-pass capacitors are respectively connected between second ends of the first and second tuning coils and the common terminal of the composite varactor device, and a control voltage supplying source parallelly supplies a control voltage to the first and second Varicap diodes.

REFERENCES:
patent: 3866138 (1975-02-01), Putzer
patent: 4291290 (1981-09-01), Ijichi et al.

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