Analog-to-digital conversion by varying both inputs of a compara

Details Analog-to-digital conversion by varying both inputs of a compara Analog-to-digital conversion by varying both inputs of a compara

1990-02-06

1991-01-08

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, H03M 134

Patent

active

049839748

ABSTRACT:
An analog-to-digital converter is provided wherein an analog input signal and one of a series of predetermined reference potentials are stored across first and second capacitors, respectively, to establish a balanced zero differential signal across the first and second inputs of a comparator. The output signal of the comparator drives a logic circuit for generating first and second portions of a digital control signal wherein the first portion selects between the lower resolution reference potentials searching for a first reference potential of the greatest value which when compared to voltage stored across the first capacitor provides the least magnitude differential signal across the first and second inputs of the comparator thereby resolving a major portion of the analog input signal. The second portion of the digital control signal selects between the fine resolution reference potentials searching for a second reference potential which minimizes the differential signal thereby resolving the remaining portion of the analog input signal. The first and second portions of the digital control signal provides the most significant bits and the least significant bits of the digital output signal, respectively. A parallel operation is also provided wherein the reference potentials are simultaneously compared in two steps to the voltage stored across the first and second capacitors via a number of comparators. The first step provides the MSB of the digital output signal and the second step provides the LSB of the digital output signal.

REFERENCES:
patent: 3495235 (1970-02-01), Ottesen
patent: 4385286 (1983-05-01), Haque
patent: 4707682 (1987-11-01), Brokaw et al.
patent: 4852130 (1989-07-01), Draxelmayr
patent: 4907002 (1990-03-01), Kawada
patent: 4908624 (1990-03-01), Goto et al.
patent: 4940981 (1990-07-01), Naylor et al.

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