Electronically tunable capacitor

Details Electronically tunable capacitor Electronically tunable capacitor

1998-05-18

1999-06-22

Hardy, David B.

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

257595, 257532, 438393, 361277, H03L 2994

Patent

active

059145137

ABSTRACT:
A tunable capacitor includes a first capacitor formed from semiconductor material and having a first terminal defining an anode, and a second capacitor integrally formed with the first capacitor from semiconductor material, the second capacitor being operatively coupled in series with the first capacitor, and having a second terminal defining a cathode. The second capacitor is formed as a field effect device or MOSFET configured to provide a depletion region controlled by applying a control voltage to a control terminal of the field effect device. The first capacitor is reverse biased by application of a reverse bias voltage between the anode and the cathode to provide a predetermined capacitance while the control voltage applied to the control terminal of the second capacitor varies the depletion region such that the capacitance of second capacitor is varied independently of the reverse bias voltage.

REFERENCES:
patent: 3535600 (1970-10-01), Engeler
patent: 3560815 (1971-02-01), Sigsbee
patent: 3890635 (1975-06-01), Engeler
patent: 4003009 (1977-01-01), Watanbe
patent: 4529994 (1985-07-01), Sakai
patent: 4529995 (1985-07-01), Sakai et al.

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