Programmable capacitor and method of operating same

Details Programmable capacitor and method of operating same Programmable capacitor and method of operating same

2005-11-08

2005-11-08

Phung, Anh (Department: 2824)

Static information storage and retrieval

Read/write circuit

Including reference or bias voltage generator

C365S063000

Reexamination Certificate

active

06963510

ABSTRACT:
A programmable capacitor in an integrated circuit (IC) comprises a conductive line located parallel to an interconnect. When a bias voltage is applied to the conductive line, a parasitic capacitance is created between the interconnect and the conductive line. By properly sizing and locating the conductive line, a desired capacitance can be coupled to the interconnect. A bias control circuit can apply or remove the bias voltage from the conductive line, thereby enabling the capacitance to be coupled or decoupled, respectively, from the interconnect. Because of its simple construction, multiple capacitive structures can be formed around a single interconnect to provide capacitive adjustment capability. By changing the number of conductive lines to which the bias voltage is applied, the total capacitance provided by the multiple capacitive structures can be varied. A feedback loop can be incorporated to provide adjustment during IC operation.

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Paul Horowitz, “The Art of Electronics” Cambridge Univ. Press, 2nd Edition, 1989.

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