Filter circuit

Details Filter circuit Filter circuit

2006-02-08

2010-11-30

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000

Reexamination Certificate

active

07843258

ABSTRACT:
A plurality of low-pass filters (2-1, 2-2, 2-3) are cascaded to the post stage of an OTA (1) and a plurality of high-pass notch filters (3-1, 3-2, 3-3) are cascaded further to the post-stage thereof so that a high-pass filter having a Q is not connected to the output of the OTA (1) having a high output impedance and a capacitor having a low capacitance is not connected with the output of th OTA (1) thus preventing multifeedback and avoiding such problems as the zero point of the notch filter (BEF) deviates from a design value or oscillation takes place.

REFERENCES:
patent: 3375451 (1968-03-01), Borelli et al.
patent: 3638037 (1972-01-01), McMurtrie
patent: 6020783 (2000-02-01), Coppola
patent: 6552604 (2003-04-01), Cargille
patent: 6867642 (2005-03-01), Maqueira
patent: 2179111 (1990-07-01), None
patent: 6314951 (1994-11-01), None
patent: 2001077716 (2001-03-01), None
International Search Report, International Application No. PCT/JP2006/302567.

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