Tuning circuit apparatus

Details Tuning circuit apparatus Tuning circuit apparatus

H - Electricity

01

J

365/9

H01J 31/14 (2006.01) H03J 3/18 (2006.01)

Patent

CA 1246256

TUNING CIRCUIT APPARATUS ABSTRACT OF THE DISCLOSURE 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.

502734

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