Summing circuit with biased inputs and an unbiased output

Details Summing circuit with biased inputs and an unbiased output Summing circuit with biased inputs and an unbiased output

1993-06-10

1995-01-24

LaRoche, Eugene R.

Static information storage and retrieval

Read/write circuit

Including reference or bias voltage generator

323313, 323314, 327361, 327530, 327540, G05F 316

Patent

active

053847393

ABSTRACT:
A band gap voltage reference circuit operates between a positive supply voltage and ground. The inputs to a difference amplifier of the band gap reference circuit are biased above the voltage drop of the base-emitter junctions of the band gap reference. The bias voltage is then subtracted from the difference amplifier output by a second difference amplifier. In addition, a bootstrap circuit assures a nonzero output from the first difference amplifier. Other embodiments wherein the band gap reference circuit is more generally a summing circuit are disclosed.

REFERENCES:
patent: 4928056 (1990-05-01), Pease
patent: 5119015 (1992-06-01), Watanabe
patent: 5229710 (1993-07-01), Kraus et al.
Kuijk, Karel E., "A precision Reference Voltage Source," Jun. 1973, IEEE Journal of Solid State Circuits, vol. SC-6 No. 3, pp. 222-226.
Vittoz, Eric A., "A Low-Voltage CMOS Bandgap Reference," Jun. 1979, IEEE Journal of Solid State Circuits, vol. SC-14, No. 3, pp. 573-577.
Ye R. and Tsividis, Y., "Bandgap Voltage Reference Sources in CMOS Technology," Electronic Letters Jan. 7, 1982 vol. 18 No. 1 pp. 24-25.
Michajda, John and Kim, Suk K., "A Precision CMOS Bandgap Reference," Dec. 1984, IEEE Journal of Solid State Circuits, vol. SC-19 No. 6, pp. 1014-1021.
Meijer, Gerard C. M., and Verhoeff, Jan B., "An Integrated Bandgap Reference," Jun. 1976, IEEE Journal of Solid State Circuits, Correspondence pp. 403-406.

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