Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Reexamination Certificate
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
Kamiya Yoshiharu
Kishi Masaki
Moribe Tsuyoshi
Yamamoto Masahiro
Arent & Fox LLP
Chang Joseph
Fujitsu Limited
LandOfFree
Variable capacity circuit and control method of variable... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable capacity circuit and control method of variable..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable capacity circuit and control method of variable... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3834036