Variable capacity circuit and control method of variable...

Details Variable capacity circuit and control method of variable... Variable capacity circuit and control method of variable...

2007-11-27

2007-11-27

Chang, Joseph (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S1170FE, C331S167000

Reexamination Certificate

active

11216000

ABSTRACT:
To present a variable capacity circuit and a control method of variable capacity capable of extending a variable capacity width of a variable capacity element to a maximum extent without increasing an element area of the variable capacity element or varying the level of control voltage, a variable capacity circuit2comprises a capacity value control circuit11,varactors VA1and VA2,and resistance elements R1and R2.The capacity value control circuit11issues a variable output voltage CNTOUT depending on input control voltage VT, and controls the potentials at both ends of the varactors simultaneously. The output voltage CNTOUT is variably adjusted so as to have a negative correlation to the control voltage VT. Variable width of terminal voltage VD can be extended from a variable width SA1to a variable width SA1a(range is +/−(Vcc1)). As a result, as shown inFIG. 5B, the changeable area of a varactor capacity value CV can be extended from a changeable area CA1to a changeable area CA1a.

REFERENCES:
patent: 6292065 (2001-09-01), Friedman et al.
patent: 7026883 (2006-04-01), Muthali et al.
patent: 11-168355 (1999-06-01), None
patent: 2002-290152 (2002-10-01), None
patent: 2004-056720 (2004-02-01), None

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