Variable tuning circuit using variable capacitance diode and...

Details Variable tuning circuit using variable capacitance diode and... Variable tuning circuit using variable capacitance diode and...

2007-11-15

2009-10-27

Pascal, Robert (Department: 2817)

Tuners

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

Reactance tuning

Reexamination Certificate

active

07609134

ABSTRACT:
The invention provides a variable tuning circuit capable of extending a variable range in a high frequency band, ensuring the value of L of an inductor to increase the value of Q of a circuit in a low frequency band, and preventing a reduction in gain, an increase in noise, and unstable oscillation.A variable tuning circuit includes: a first parallel resonance circuit that includes a varactor diode, a capacitor connected in series to the varactor diode, and a first inductor connected in parallel to the varactor diode and the capacitor; and a second parallel resonance circuit that includes a second inductor connected in parallel to the varactor diode with a direct current cut-off capacitor interposed therebetween. When the varactor diode has a maximum capacitance, a resonant frequency of the second parallel resonance circuit is set about a lowest frequency in a variable frequency range.

REFERENCES:
patent: 2196881 (1940-04-01), Wheeler
patent: 3628152 (1971-12-01), Carlson
patent: 4271529 (1981-06-01), Strammello, Jr.
patent: 4409557 (1983-10-01), Sechi
patent: 4628540 (1986-12-01), Hendriks
patent: 10-242805 (1998-09-01), None
European Search Report dated Apr. 9, 2008 from European Application No. 07023359.8.

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