Filter circuit with an intermittent constant current with consta

Details Filter circuit with an intermittent constant current with consta Filter circuit with an intermittent constant current with consta

1997-09-12

1999-12-14

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 327 65, 327563, H03B 100

Patent

active

060022965

ABSTRACT:
A periodic low current from an intermittent Low current generator 5 is used, and fluctuations of r1 and r10, c1 and c2, and I6 and I20, thus cancel one another. Thus, .omega..sub.0 is not fluctuated unless the oscillation frequency Tosc of a pulse wave generator OSC is fluctuated. Television and ratio audio ICs using an LPF filter do not require specific provision of any oscillator for a filter circuit, because they have an accurate oscillator. The oscillation frequency of the pulse wave generator OSC should be at least 20 times the pass band of the filter circuit.

REFERENCES:
patent: 5266852 (1993-11-01), Shinegari et al.
patent: 5396188 (1995-03-01), Aoki
patent: 5461336 (1995-10-01), Yada
patent: 5698998 (1997-12-01), Bodenstab
patent: 5796545 (1998-08-01), Canclini

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