Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Reexamination Certificate
2006-08-15
2006-08-15
Chang, Joseph (Department: 2817)
Oscillators
With frequency adjusting means
With voltage sensitive capacitor
C257S312000
Reexamination Certificate
active
07091797
ABSTRACT:
The present invention provides a MOS-type variable capacitance element which can obtain a sufficient capacitance valuable width and, at the same time, can eliminate restrictions imposed on a control voltage range. A MOS-type variable capacitance element includes a MOS transistor in which an N well having polarity opposite to polarity of the P type is formed on a P type semiconductor substrate, a pair of source and drain regions are formed in the inside of the N well, an N-type high-concentration region is formed in the inside of the N well, a gate oxide film is formed on the N well, and a gate electrode is formed on the gate oxide film, a first electrode which connects the source and drain regions to a reference potential, a second electrode which is connected to the gate electrode, and a third electrode which is connected to the N well and applies a control voltage having polarity equal to polarity of the P type to the N well using the reference potential as a reference, wherein a variable capacitance element is provided between the second electrode and the third electrode.
REFERENCES:
patent: 6100770 (2000-08-01), Litwin et al.
patent: 6469587 (2002-10-01), Scoggins
patent: 6521939 (2003-02-01), Yeo et al.
patent: 2001-516955 (2001-10-01), None
Pietro Andreani et al.; On the Use of MOS Varactors in RF VCO's; IEEE Journal of Solid State Circuits: vol. 35, No. 6, Jun. 2000, pp. 905-910.
Chang Joseph
Jordan and Hamburg LLP
Seiko NPC Corporation
LandOfFree
MOS-type variable capacitance element and voltage control... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with MOS-type variable capacitance element and voltage control..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and MOS-type variable capacitance element and voltage control... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3682349