Constant current circuit

Details Constant current circuit Constant current circuit

2007-04-03

2007-04-03

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S513000

Reexamination Certificate

active

11053945

ABSTRACT:
A constant current circuit in which a bias voltage of a field effect transistor is set includes a bias circuit which sets, as the bias voltage, a gate-source voltage VGS′ corresponding to an intersecting point between an ID- VGScharacteristic curve at arbitrary first temperature and an ID-VGScharacteristic curve at arbitrary second temperature which is different from the first temperature in the ID-VGScharacteristic of the drain current IDto a gate-source voltage VGSof the field effect transistor. The bias circuit is comprised of a plurality of semiconductor resistors having substantially similar temperature coefficients so as to be able to transmit heat to each other.

REFERENCES:
patent: 5654663 (1997-08-01), McClure et al.
patent: 6377113 (2002-04-01), Kanno
patent: 6496057 (2002-12-01), Wada et al.

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