Dynamic bandwidth compensating method and associated apparatus

Details Dynamic bandwidth compensating method and associated apparatus Dynamic bandwidth compensating method and associated apparatus

2008-01-02

2009-06-23

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including signal feedback means

C330S253000, C330S254000

Reexamination Certificate

active

07551033

ABSTRACT:
A programmable gain amplifier includes an operational amplifier coupled thereto a plurality of resistors to perform a feedback control, thereby rendering a closed-loop gainAf⁡(s)=A⁡(s)1+A⁡(s)·β,where β is a feedback factor determined by the resistance of the resistors and A(s) is an open-loop gain of the operational amplifier. The operational amplifier includes a first-stage amplifying circuit, a second-stage amplifying circuit, and a compensating capacitor coupled to an output end of the first-stage amplifying circuit and having an equivalent capacitance variable to adjust a dominant-pole frequency of the open-loop gain of the operational amplifier.

REFERENCES:
patent: 5635871 (1997-06-01), Cavigelli
patent: 6002299 (1999-12-01), Thomsen
patent: 6020785 (2000-02-01), Allen et al.
patent: 6148048 (2000-11-01), Kerth et al.
patent: 7154331 (2006-12-01), Zaguri
patent: 7324615 (2008-01-01), Lourens et al.

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