Cut-off frequency setting circuit of a filter circuit

Details Cut-off frequency setting circuit of a filter circuit Cut-off frequency setting circuit of a filter circuit

1993-03-12

1995-05-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327 66, 327564, H03K 500

Patent

active

054184835

ABSTRACT:
A cut-off frequency setting circuit of a filter circuit comprises a filter circuit possessing an analog signal input terminal for adjustment of the cut-off frequency, a memory capable of rewriting data, and a D/A converter for producing an analog current according to the output data from the memory and for supplying the analog current into the analog input terminal for adjustment of the cut-off frequency of the filter circuit.

REFERENCES:
patent: 4045731 (1977-08-01), Tokunov et al.
patent: 4392068 (1983-07-01), Welles, II
patent: 4451795 (1984-05-01), Kilian
patent: 4812773 (1989-03-01), Yamamoto et al.
patent: 4890259 (1989-12-01), Simko
patent: 5023491 (1991-06-01), Koyama
patent: 5101509 (1992-03-01), Lai

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