Two-stage a-to-d converter

Details Two-stage a-to-d converter Two-stage a-to-d converter

1981-10-09

1984-11-27

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

324 99D, 340347M, 340347NT, H03K 1302, H03K 1308, H03K 1320

Patent

active

044853726

ABSTRACT:
A two-stage analog-to-digital converter wherein the first stage is a resistor-string d-to-a converter controlled by a successive-approximation register, functioning in a first phase of the conversion operation to determine a set of higher order bits of the digital output signal. The second stage is a dual-slope integrating-type a-to-d converter functioning in a second phase of the conversion operation to determine the remaining lower-order bits of the digital output signal. The dual-slope converter receives a reference signal derived from two adjacent junction points of the first-stage resistor-string d-to-a converter corresponding to the higher order bits determined in the first phase of operation, thereby to assure high resolution performance.

REFERENCES:
patent: Re29992 (1979-05-01), Wold
patent: 3316547 (1967-04-01), Ammann
patent: 3646548 (1972-02-01), Van Doren
patent: 3656153 (1972-04-01), Takeda et al.
patent: 3997892 (1976-12-01), Susset
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-46 to II-51; II-80 & II-81.

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