Low noise lowpass filter

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Details

C327S552000

Reexamination Certificate

active

07375583

ABSTRACT:
A differential biquad filter includes positive and negative single ended circuits connected between first and second power supply terminals. Each single ended circuit includes a single input terminal; a transistor having a control terminal, and first and second main terminals; a single output terminal corresponding to the control terminal of the transistor; first and second conductances connected between the single input terminal and the control terminal of the transistor; a first capacitance connected between the control terminal of the transistor and the second main terminal of the other single ended circuit; and a second capacitance connected between the node between the first and second conductances on one hand and the second main terminal of the transistor on the other hand. The differential biquad filter also includes a fifth capacitance connected between the second main terminals of each transistor of each single ended circuit.

REFERENCES:
patent: 4524332 (1985-06-01), Gay
patent: 4877979 (1989-10-01), Sempel
patent: 5227681 (1993-07-01), Koyama et al.
patent: 5489872 (1996-02-01), Gopinathan
patent: 6011431 (2000-01-01), Gilbert
patent: 6335655 (2002-01-01), Yamamoto
patent: 0 274 784 (1988-07-01), None

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