Apparatus and method for controlling operation of an...

Details Apparatus and method for controlling operation of an... Apparatus and method for controlling operation of an...

2006-06-13

2006-06-13

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S296000

Reexamination Certificate

active

07061323

ABSTRACT:
An apparatus for controlling operation of an amplifier device when supply voltage provided to the amplifier device varies at an input voltage supply locus. The amplifier device has an operating parameter varying in generally direct proportion with the supply voltage. The apparatus includes: (a) a reference parameter supply providing a reference parameter; (b) a modeling circuit coupled with the input voltage supply locus that models the amplifier device; (c) a comparing circuit coupled with the modeling circuit and the reference parameter supply that compares a model operating parameter from the modeling circuit and the reference parameter and provides a control signal to the modeling circuit and the amplifier device in response to the comparing; the control signal alters operation of the modeling circuit and the amplifier device to reduce variance between the reference parameter and the model operating parameter from a predetermined relationship.

REFERENCES:
patent: 4887048 (1989-12-01), Krenik et al.
patent: 5381113 (1995-01-01), Kimura

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