Digitally tunable capacitor

Details Digitally tunable capacitor Digitally tunable capacitor

2008-10-03

2010-11-02

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

C327S554000, C327S362000

Reexamination Certificate

active

07825715

ABSTRACT:
The disclosed device can contain a pair of switchable capacitors, one of which has the larger capacitance of the pair. Each of the switchable capacitors can include a capacitor in series with a switch. Both switchable capacitors can be connected in a parallel circuit that has a tunable capacitance. The ratio of the capacitances of the pair can approximately equal a ratio of mutually prime integers. In a particular case, the ratio of capacitances can approximately equal a ratio of two consecutive integers. The capacitance ratio can be called a weight or weight ratio. A switch controller can drive the pair of switchable capacitors with a pair of (M+1)-ary pulse width modulated signals, each of which has the same modulation period.

REFERENCES:
patent: 6677814 (2004-01-01), Low et al.
patent: 7183725 (2007-02-01), Kim
patent: 7375597 (2008-05-01), Greenberg et al.
patent: 7471143 (2008-12-01), Kim

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