Voltage controlled variable capacitor

Details Voltage controlled variable capacitor Voltage controlled variable capacitor

H - Electricity

01

L

331/14, 356/26

H01L 29/94 (2006.01) H03B 5/36 (2006.01) H03B 7/06 (2006.01)

Patent

CA 1310078

- 13 - VOLTAGE CONTROLLED VARIABLE CAPACITOR Abstract A voltage variable capacitor (VVC) having two terminals in a variable frequency crystal oscillator integrated into a common substrate with the oscillator circuitry and isolated therefrom. The VVC is constructed using the same processing steps as the oscillator circuitry and achieves low series resistance and wide capacitance variation by utilizing a substrate or epitaxial layer (body) having a well with a diffused region therein. The region, of the same conductivity type as the well and a first one of the two terminals, forms a rectangular ring in the well. Over theregion and insulated therefrom, a conductive layer is deposited to provide a second one of the two terminals. Both terminals are electrically isolated from the body.

582371

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