Method and circuitry for generating reference voltages

Details Method and circuitry for generating reference voltages Method and circuitry for generating reference voltages

1986-11-12

1989-02-14

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307352, 307353, 307261, 328127, 328128, 328151, 328186, H03K 402, H03K 5159, H03K 500

Patent

active

048048631

ABSTRACT:
Method and circuitry for generating precise reference voltages. The method includes generation of a stair-step voltage waveform wherein the voltage changes from step to step are virtually identical. The stair-step voltage waveform generation includes charging a first capacitor to an available voltage reference and then transferring the charge to a larger second capacitor. This charging and subsequent charge transferring is repetitively performed to generate the stair-step waveform across the terminals of the larger capacitor. Sample-and-hold circuits are used to sample the steps of the stair-step voltage waveform and thereby provide a set of DC reference voltages. The circuitry is suitable for fabrication in a CMOS monolithic integrated circuit and can be used in conjunction with flash A/D converters.

REFERENCES:
patent: 4361771 (1982-11-01), Reinke
patent: 4439693 (1984-03-01), Lucas et al.
patent: 4498063 (1985-02-01), Makabe et al.
Bosshart, "A Multiplexed Switched Capacitor Filter Bank," IEEE Journal of Solid-State Circuits, vol. SC-15, No. 6, Dec. 1980, pp. 939-945.
Ghausi, et al., Modern Filter Design, Prentice-Hall, Inc., Englewood Cliffs, NH 07632, 1981, pp. 376-387, 454-474 and 496-501.
Tsukada et al., "CMOS 8b 25MHz Flash ADC," Proceedings of 1985 IEEE International Solid-State Circuits Conference, pp. 34 and 35.
Allstot et al., "An Electrically-Programmable Switched Capacitor Filter," IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 1034-1041.

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