gm-C cell with two stage common mode control and current boost

Details gm-C cell with two stage common mode control and current boost gm-C cell with two stage common mode control and current boost

1997-06-11

1999-01-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 330258, H03B 100

Patent

active

058567577

ABSTRACT:
A gm-C circuit includes a two-stage common mode control loop to limit the common mode voltage during circuit operation. To prevent latch-up in a cross-coupled differential gm-C type filter, the common mode control loop includes a circuit which provides extra current capability to the common-mode control loop without increasing the quiescent current. This is accomplished by a current boost technique that provides large amounts of current when needed, while running in a low current mode under normal circumstances.

REFERENCES:
patent: 5117205 (1992-05-01), Nauta
patent: 5465072 (1995-11-01), Atarodi
patent: 5734294 (1998-03-01), Bezzam et al.

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