Bias circuit with controlled temperature dependence

Details Bias circuit with controlled temperature dependence Bias circuit with controlled temperature dependence

2005-04-12

2005-04-12

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

C330S296000

Reexamination Certificate

active

06879214

ABSTRACT:
A bias control circuit generates a bias control current that is proportional to temperature. The bias control current is drawn from a first node of a bias circuit. The first node of the bias circuit is also configured to receive a relatively large first current that is also proportional to temperature. A bias current is also drawn from the first node, wherein the bias current is equal to the difference between the relatively large first current and the bias control current. The temperature sensitivities of the bias control current and the relatively large first current are matched, such that the bias control current is relatively insensitive to changes in temperature.

REFERENCES:
patent: 4251778 (1981-02-01), Ahmed
patent: 5394112 (1995-02-01), Alini et al.
patent: 5654665 (1997-08-01), Menon et al.
patent: 6091286 (2000-07-01), Blauschild
patent: 6452454 (2002-09-01), Shapiro et al.

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