Temperature compensated current reference circuit

Details Temperature compensated current reference circuit Temperature compensated current reference circuit

2011-06-21

2011-06-21

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

C327S538000

Reexamination Certificate

active

07965129

ABSTRACT:
A temperature compensated current reference circuit has a differential amplifier and a first feedback transistor with a gate coupled to the differential amplifier output. The first feedback transistor couples a supply voltage line to an inverting input of the differential amplifier. There is also a second feedback transistor with a gate coupled to the differential amplifier output, which couples the supply voltage line to a non-inverting input of the differential amplifier. A first temperature dependent conductor couples the inverting input to ground. A primary reference resistor and a second temperature dependent conductor are connected in series and couple the non-inverting input to ground. An output current control transistor has a gate and one other electrode coupled together and a third electrode coupled to the supply voltage line. A secondary reference resistor and a conductivity change sensing transistor are connected in series and couple the gate of the output current control transistor to ground. The conductivity change sensing transistor has a gate coupled to the second one of the two differential inputs. There is a temperature compensation current reference output circuit that has a current reference transistor, an input coupled to the differential amplifier output and another input is coupled to the gate of the output current control transistor.

REFERENCES:
patent: 6738297 (2004-05-01), Di Iorio
patent: 6911861 (2005-06-01), Deng
patent: 7372316 (2008-05-01), Chatterjee et al.
patent: 7456678 (2008-11-01), Passerini et al.
patent: 7888987 (2011-02-01), Horie
Banba et al, “A CMOS Bandgap Reference Circuit With Sub 1-V Operation”, IEEE JSSC, May 1999.

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