Gm-C time constant tuning circuit

Details Gm-C time constant tuning circuit Gm-C time constant tuning circuit

2007-07-03

2007-07-03

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000

Reexamination Certificate

active

11164659

ABSTRACT:
A circuit including a Gm-C filter and an automatic Gm-C time constant tuning circuit is provided. The tuning circuit includes a reference conductor, a reference capacitor coupled to the reference conductor, a comparator generating signals according to a reference signal and the voltage signal at the output of the reference conductor, a feedback capacitor, and a charge pump charging and discharging a feedback capacitor according to the output of the comparator. The feedback capacitor provides a control voltage feedback to the tuning circuit and to the Gm-C filter for adjusting the conductance. Hence, in doing so, errors like manufacturing variation and offset can be prevented.

REFERENCES:
patent: 6194958 (2001-02-01), Goldfarb et al.
patent: 6400932 (2002-06-01), Oh et al.

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