Gainboost biasing circuit for low voltage operational...

Details Gainboost biasing circuit for low voltage operational... Gainboost biasing circuit for low voltage operational...

2008-02-27

2009-06-30

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S278000, C330S254000

Reexamination Certificate

active

07554403

ABSTRACT:
Bias current generation circuits and systems are disclosed. In one embodiment, a gain boosting cascode system comprises a cascode based on a transconductance amplifier and a current buffer and a gain booster circuit coupled to the cascode optimally boosting a gain of the cascode by maintaining the transconductance amplifier and the current buffer in their respective saturation regions. The gain booster circuit is based on one or more feedback amplifiers coupled in series with a main voltage control transistor. The main voltage control transistor is maintained in a triode region, and the voltage at the drain of the main voltage control transistor can be set by passing an appropriate amount of current through the main voltage control transistor. This in turn would keep the transconductance amplifier and the current buffer in their respective saturation regions, thus generating the optimal gain for the gain boosted cascode system.

REFERENCES:
patent: 3986060 (1976-10-01), Nishizawa et al.
patent: 6064267 (2000-05-01), Lewyn
patent: 6326846 (2001-12-01), Brandt
patent: 6667660 (2003-12-01), Schrodinger et al.
patent: 6961546 (2005-11-01), Rofougaran et al.
patent: 7075373 (2006-07-01), Briskin et al.
patent: 7262664 (2007-08-01), Joffe et al.
patent: 7368993 (2008-05-01), Beffa

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