Adapting operational amplifier frequency response respective...

Details Adapting operational amplifier frequency response respective... Adapting operational amplifier frequency response respective...

2006-12-26

2006-12-26

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

07154331

ABSTRACT:
Methods and apparatuses relating to current and gain adjustment in an amplifier. A gain of an amplifier, e.g., closed loop gain, may be increased or decreased based on a swing of a received signal. A current of an internal amplifier stage may be increased or decreased in relation to the increasing or decreasing of the gain to provide adjustments to bandwidth and/or frequency response. In one embodiment a programmable gain amplifier having operational amplifier has a variable feedback resistor increased/decreased in steps and a bias current of a differential stage of the operational amplifier may be increased/decreased in proportional steps.

REFERENCES:
patent: 3737628 (1973-06-01), Azure, Jr.
patent: 4277974 (1981-07-01), Karr et al.
patent: 4306198 (1981-12-01), Okada
patent: 6930549 (2005-08-01), Kajiwara et al.

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