Active filter

Details Active filter Active filter

2006-11-07

2006-11-07

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S337000

Reexamination Certificate

active

07132881

ABSTRACT:
In order to reduce capacitance of a feedback section of an operational amplifier provided in a semiconductor integrated device, an active filter includes an operational amplifier in which a plurality of capacitive elements are connected between (i) an output terminal and (ii) an inverting input terminal or an input terminal. This arrangement does not require any special technique and amendment of an ordinary integrated circuit process. Further, this arrangement ensures small capacitance in the feedback section of the operational amplifier, while preventing deterioration in S/N ratio, and increases in switching noise and power consumption.

REFERENCES:
patent: 4498063 (1985-02-01), Makabe et al.
patent: 4743872 (1988-05-01), Tanimoto
patent: 4984292 (1991-01-01), Millen
patent: 5999042 (1999-12-01), Hemdal et al.
patent: 6344773 (2002-02-01), Sevastopoulos et al.
patent: 6816004 (2004-11-01), Easwaran et al.

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