Voltage reference circuit

Details Voltage reference circuit Voltage reference circuit

2007-11-27

2007-11-27

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C323S316000, C323S907000

Reexamination Certificate

active

11470499

ABSTRACT:
A voltage reference circuit including a positive temperature coefficient current generator, a negative temperature coefficient current generator, and a first resistor is provided. In the positive temperature coefficient current generator, two transistors are operated in the weak inversion region, and a second resistor is connected in series between the gates of the two transistors. The second resistor employs the characteristic that a transistor operated in weak inversion region acts like a bipolar junction transistor to generate a positive temperature coefficient current. The negative temperature coefficient current generator generates a negative temperature coefficient current in response to a negative temperature coefficient voltage drop on a third resistor. The positive temperature coefficient current and the negative temperature coefficient current flow through the first resistor together, thus producing a stable reference voltage.

REFERENCES:
patent: 6563295 (2003-05-01), Juang
patent: 6906581 (2005-06-01), Kang et al.
patent: 6958597 (2005-10-01), Lin et al.
Jointly authored by Nissinen, et al. , Article title “A Low Voltage CMOS Constant Current-Voltage Reference Circuit” IEEE International Symposium on Circuits and System(ISCAS 2004), Vancouver, Canada, May 23-26, 2004, vol. I, pp. 318-384.
Jointly authored by Hu, et al., Article title “A 900 mV 25 FW High PSRR CMOS Voltage Reference Dedicated to Implantable Micro-Devices” IEEE-ISCAS 2003, Thailand, pp. 373-376, no month.
Jointly authored by T. Ytterdal, Article title “CMOS bandgap voltage reference circuit for supply voltages down to 0.6 V” IEE Electronic Letters, vol. 39, No. 20, pp. 1427-1428, Oct. 2, 2003.

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