Method and system for minimizing differential amplifier...

Details Method and system for minimizing differential amplifier... Method and system for minimizing differential amplifier...

2006-04-04

2006-04-04

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000

Reexamination Certificate

active

07023277

ABSTRACT:
The invention includes an apparatus and a method for minimizing power supply sensitivity of a differential amplifier. The apparatus includes a current source providing a differential amplifier bias current to a common source node of the differential amplifier. A voltage sensor senses variations of a power supply associated with the current source. Variations sensed by the voltage sensor control a magnitude of the differential amplifier bias current. The method includes a current source providing the source current. A voltage potential of the common source node is sensed. The current source is adjusted depending upon the sensed voltage potential of the common source node, thereby adjusting a magnitude of the source current.

REFERENCES:
patent: 6072349 (2000-06-01), Pippin et al.
patent: 6128239 (2000-10-01), Perner
patent: 6563381 (2003-05-01), Strong
patent: 6563382 (2003-05-01), Yang

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