Common-mode controlled differential gain boosting

Details Common-mode controlled differential gain boosting Common-mode controlled differential gain boosting

2003-06-13

2004-12-14

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S543000, C323S316000

Reexamination Certificate

active

06831501

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to current sources, and, in particular, to a current source with common-mode differential gain boosting.
BACKGROUND OF THE INVENTION
Current sources are configured to provide an approximately constant output current to a load over a specified range of load voltages. High output impedance is an important characteristic for a current source. When a current source has a high output impedance, changes in the load conditions result in minimal changes in the output current that is provided to the load. Another important characteristic for current sources is output compliance, the range of load voltages for which an approximately constant output current is maintained.
Current sources have numerous applications. For example, current sources can be used as active loads (e.g. for differential amplifiers). Current sources can be used to bias other circuit elements. Current sources are also used in integrators and ramp generators.


REFERENCES:
patent: 5337021 (1994-08-01), Zarabadi et al.
patent: 6445223 (2002-09-01), Thilenius
patent: 6448844 (2002-09-01), Cho
Gray et al., “Analysis and Design of Analog Integrated Circuits,” Fourth Edition, pp. 273-274.

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