Circuit for generating a process variation insensitive reference

Details Circuit for generating a process variation insensitive reference Circuit for generating a process variation insensitive reference

1994-08-24

1995-11-21

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327540, 327542, 327543, G05F 110

Patent

active

054691117

ABSTRACT:
In a comparator circuit, a reference bias current generation circuit uses an MOS transistor rather than a resistor to generate a current based on the difference between the base-emitter voltages of two bipolar transistors. In one embodiment, a second MOS transistor matched to the first MOS transistor is used to provide a current substantially independent of variations of the threshold voltage due to variations in the manufacturing process. A reference voltage source is provided to adjust the temperature coefficient of the reference bias current.

REFERENCES:
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patent: 4675594 (1987-06-01), Reinke
patent: 4783607 (1988-11-01), Hsieh
patent: 4837459 (1989-06-01), Bukowski
patent: 5153500 (1992-10-01), Yamamoto et al.
patent: 5339272 (1994-08-01), Tedrow et al.
Article entitled "A Quad CMOS Single-Supply Op Amp With Rail-to-Rail Output Swing" by Dennis M. Monticelli, IEEE Journal, vol. SC-21, No. 6, Dec. 1986, pp. 1026-1034.
Excerpt from book entitled "Analysis and Design of Analog Integrated Circuits", Second Edition, by Paul R. Gray and Robert G. Meyer, University of California, Berkeley, John Wiley & Sons, pp. 275-289.

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