Discrete programming methodology and circuit for an active trans

Details Discrete programming methodology and circuit for an active trans Discrete programming methodology and circuit for an active trans

1995-11-17

1997-09-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 327103, 327554, 330258, 330109, H03K 500, H03F 345

Patent

active

056660839

ABSTRACT:
A circuit and method for adjusting a cutoff frequency of an active filter, such as a gm-C filter, which has a common mode feedback circuit for providing a bias signal may include plural common base stages having first inputs connected in parallel to a stage of the active filter and second inputs connected in parallel to an output from the common mode feedback circuit, and a capacitor connected to an output from each of the common base stages. The common base stages and their connected capacitors are selectively isolated from the filter output to adjust the cutoff frequency of the filter. The deselected common base stages are also isolated from the common mode feedback circuit and bias generator inputs.

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patent: 4977378 (1990-12-01), Tero
patent: 5001441 (1991-03-01), Gen-Kuong
patent: 5015966 (1991-05-01), McIntyre
patent: 5331218 (1994-07-01), Moody et al.
patent: 5345190 (1994-09-01), Kaylor
patent: 5491447 (1996-02-01), Goetschel et al.

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