Low voltage differential amplifier circuit for wide voltage...

Details Low voltage differential amplifier circuit for wide voltage... Low voltage differential amplifier circuit for wide voltage...

2007-01-23

2007-01-23

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000

Reexamination Certificate

active

10868145

ABSTRACT:
A differential amplifier design and bias control technique of particular applicability for low voltage operation in which the threshold voltage of n-channel differential input transistors is controlled using substrate bias in order to allow a wider range of input signal levels. Further disclosed is a technique for controlling the substrate bias of the input transistors of a differential amplifier based on the level of the output of the amplifier in addition to a differential amplifier circuit capable of low voltage operation in which an additional bias current is introduced that enables the output pull-up current to be increased without increasing the pull-down current, as well as circuitry for optimizing the performance of the differential in both DDR-I and DDR-II operational modes.

REFERENCES:
patent: 4460874 (1984-07-01), Haque
patent: 4658157 (1987-04-01), McGowan
patent: 5045806 (1991-09-01), Yan
patent: 5142244 (1992-08-01), Glica et al.
patent: 6140877 (2000-10-01), Forbes
patent: 6509795 (2003-01-01), Ivanov
patent: 6614301 (2003-09-01), Casper et al.
patent: 2005/0275463 (2005-12-01), Heightley

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