Voltage-controlled variable-capacitance device

Details Voltage-controlled variable-capacitance device Voltage-controlled variable-capacitance device

2005-03-08

2005-03-08

Reichard, Dean A. (Department: 2831)

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

C361S272000, C361S278000, C361S287000, C361S292000, C361S296000

Reexamination Certificate

active

06865066

ABSTRACT:
First and second varactors are disposed on a surface of a P-type substrate. The first varactor includes an N well disposed in the surface of the P-type substrate, a gate insulator disposed on the N well, and an N-type polysilicon layer disposed on the gate insulator. The second varactor includes an N well disposed in the surface of the P-type substrate, a gate insulator disposed on the N well, and a P-type polysilicon layer disposed on the gate insulator. The N-type polysilicon layer and P-type polysilicon layer are connected to a gate terminal. The N wells are connected to an SD terminal via P+diffusion layers. The N-type polysilicon layer and P-type polysilicon layer have different work functions.

REFERENCES:
patent: 6509805 (2003-01-01), Ochiai
patent: 6737929 (2004-05-01), Cui et al.
patent: 20040012450 (2004-01-01), Nguyen
patent: 2002-043842 (2002-02-01), None

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