Feedback circuit

Amplifiers – Signal feedback – In cascade amplifiers

Reexamination Certificate

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Details

C330S103000

Reexamination Certificate

active

11200056

ABSTRACT:
For reducing various adverse effects due to provision of a low-pass filter, while suppressing an oscillation generated therein, there is provide a feedback circuit, having at least one operational amplifier, having a low-pass filter in an output portion thereof, for feeding a signal from the output portion back thereto, including: a first feedback circuit portion for negatively feeding a signal from an input terminal of the low-pass filter back to an inverted input terminal of the operational amplifier; and a second feedback circuit portion for negatively feeding a signal from an output terminal of the low-pass filter back to the inverted input terminal of the operational amplifier. In such the structure, the second feedback circuit portion is preferably provided with two sets of a first feedback operational amplifier and a second feedback operational amplifier, and the first feedback operational amplifier has a non-inverted input terminal connected to a predetermined input signal and has an inverted input terminal connected to the output terminal of the low-pass filter.

REFERENCES:
patent: 5345165 (1994-09-01), Froeschle et al.
patent: 5410592 (1995-04-01), Wagner et al.
patent: 6249182 (2001-06-01), Pullen
patent: 6441685 (2002-08-01), MacMillan
patent: 6566947 (2003-05-01), Gorcea
patent: 6642696 (2003-11-01), Tateishi
patent: 6744318 (2004-06-01), Yokoyama et al.

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