Temperature independent reference circuit

Details Temperature independent reference circuit Temperature independent reference circuit

2011-08-16

2011-08-16

Zweizig, Jeffrey S (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

07999606

ABSTRACT:
A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1and R2, and third and second temperature coefficients, TC3and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.

REFERENCES:
patent: 6724244 (2004-04-01), Wu
patent: 6933769 (2005-08-01), Koelling
patent: 7193402 (2007-03-01), Lee et al.
patent: 7301389 (2007-11-01), Coady
patent: 7348830 (2008-03-01), Debroux
patent: 7616050 (2009-11-01), Eckstein

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