Method and apparatus for controlling common-mode output...

Details Method and apparatus for controlling common-mode output... Method and apparatus for controlling common-mode output...

2006-05-30

2006-05-30

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000

Reexamination Certificate

active

07053712

ABSTRACT:
A method for controlling the common-mode output voltage in a fully differential amplifier includes comparing a sensed common-mode output voltage of the fully differential amplifier to a reference voltage, and generating an error signal representing the difference between the sensed common-mode output voltage and the reference voltage. The error signal is utilized to control the body voltage of one or more FET devices included within the fully differential amplifier until the sensed common-mode output voltage is in agreement with said reference voltage.

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James Karki, “Fully-Differential Amplifiers;” Texas Instruments Application Report, SLOA054D—Jan. 2002.
Art Kay, “Increase Common-Mode Range for Fully Differential Amplifiers;” found at http://www.elecdesign.com/articles/index.cfm?articleID=5395.

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