Constant current circuit operating independent of temperature

Details Constant current circuit operating independent of temperature Constant current circuit operating independent of temperature

2006-08-18

2008-08-12

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S513000, C327S543000, C323S312000, C323S315000

Reexamination Certificate

active

07411442

ABSTRACT:
In CMOS processing, there may be a case in which a resistance element, such as a poly-silicon resistance, or the like, may be formed which has negative temperature characteristics. In a constant current circuit using this resistance element, a constant current output less affected by the influence of varying temperature is obtained. To a load-side path of a current mirror circuit, a serial connection circuit and a temperature compensation circuit are arranged in parallel each other. The serial connection circuit includes a transistor Q1, a resistance element R1and a bipolar transistor Q6and flows a current I1having positive temperature characteristics. The temperature compensation circuit includes a transistor Q8and a resistance element R2and flows a current I2having negative temperature characteristics. A constant current output based on the sum current I of the currents I1and I2is obtained.

REFERENCES:
patent: 5557194 (1996-09-01), Kato
patent: 5910749 (1999-06-01), Kimura
patent: 6348832 (2002-02-01), Chih
patent: 6522117 (2003-02-01), Young et al.
patent: 6667653 (2003-12-01), Kronmueller et al.
patent: 6724244 (2004-04-01), Wu
patent: 6759893 (2004-07-01), Gailhard et al.
patent: 7071767 (2006-07-01), Ou-yang et al.

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