High accuracy analog-to-digital converter with rail-to-rail refe

Details High accuracy analog-to-digital converter with rail-to-rail refe High accuracy analog-to-digital converter with rail-to-rail refe

1990-06-14

1991-05-14

Scott, J. R.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341172, 341165, 341150, 341145, H03M 146, H03M 168

Patent

active

050160141

ABSTRACT:
An analog-to-digital inverter includes successive approximation control logic for generating ten-bit binary numbers, a digital-to-analog converter (DAC) having a resistor string and a weighted-capacitor array for converting the ten-bit binary output of the control logic to a known analog voltage, and an analog comparator for comparing the output of the DAC to a reference voltage provided via a tap to the mid-point of the DAC resistor string. The unknown analog voltage input to the ADC and the reference voltage are provided to the capacitor array to precharge the array to a voltage equal to the reference voltage minus the unknown analog voltage. The output of the DAC is therefore equal to the known analog voltage plus the reference voltage minus the unknown analog voltage.

REFERENCES:
patent: Re32313 (1986-12-01), Yamakido
patent: 4366439 (1982-12-01), Yamakido
patent: 4369433 (1983-01-01), Yamakido
patent: 4384277 (1983-05-01), Allgood et al.
patent: 4385286 (1983-05-01), Haque
patent: 4388612 (1983-06-01), Takagi et al.
patent: 4907002 (1990-03-01), Kawada
"High-Resolution A/D Conversion in MOS/LSI" by B. Fotouhi, et al., IEEE J. Solid-State Circuits, vol. SC-11, No. 6, Dec. 1976, p. 136.
"A Precision Variable-Supply CMOS Comparator" by David J. Allstot, IEEE Journal of Solid-State Circuits, vol. SC-17, No. 6, Dec. 1982, p. 1082.
"A 10-Bit 5-Msample/s CMOS Two-Step Flash ADC" by J. Doernberg, et al., IEEE Journal of Solid-State Circuits, vol. 24, No. 2, Apr. 1989, p. 241.
"All-CMOS Charge Redistribution Analog-To-Digital Conversion Techniques-Part II" by R. Suarez, et al., IEEE J. Solid-State Circuits, vol. SC-10, pp. 379-385, Dec. 1975.

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