Tuning circuit preventing a deterioration of Q value

Details Tuning circuit preventing a deterioration of Q value Tuning circuit preventing a deterioration of Q value

2006-07-05

2008-10-14

Le, Don P (Department: 2819)

Tuners

With switching means

Capacitor only modified or substituted by switching

C334S078000

Reexamination Certificate

active

07436276

ABSTRACT:
A tuning circuit comprises, at least, a first circuit K1which serially connects a first variable capacitor element21aand a second variable capacitor element31a, an inductance element23awhich is parallely connected to the first circuit K1and constitutes a resonance circuit with the first circuit K1; a second circuit K2which includes a switch element26aand a third resistor27aserially connected to each other and is parallely connected to the first circuit K1; and a first resistor24aand a second resistor and25awhich are connected to both ends of the first variable capacitor element21a, respectively and apply a predetermined tuning voltage.

REFERENCES:
patent: 3526859 (1970-09-01), Putzer
patent: 5565779 (1996-10-01), Arakawa et al.
patent: 2005/0212610 (2005-09-01), Brekelmans
patent: 2005/0261797 (2005-11-01), Cyr et al.
patent: 2006/0071726 (2006-04-01), Matsuo et al.
patent: 2007/0075798 (2007-04-01), Amano
patent: 2000-156648 (2000-06-01), None
patent: 2003-309777 (2003-10-01), None

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