Active filter independently controlling cut-off frequency and qu

Details Active filter independently controlling cut-off frequency and qu Active filter independently controlling cut-off frequency and qu

1996-02-20

1997-09-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 330305, H03H 1112, H03K 500

Patent

active

056636768

ABSTRACT:
A series of first and second operational amplifier circuits form a low-pass filter together with capacitors, and a current controlling circuit is responsive to a frequency control signal representative of a target cut-off frequency of the filter and a quality factor control signal representative of a target quality factor so as to respectively supply first and second controlling currents to the first and second operational amplifiers, thereby independently controlling the cut-off frequency and the quality factor with the frequency control signal and the quality factor control signal.

REFERENCES:
patent: 5117205 (1992-05-01), Nauta
patent: 5396188 (1995-03-01), Aoki

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