Integrating analog-to-digital converter having digitally-derived

Details Integrating analog-to-digital converter having digitally-derived Integrating analog-to-digital converter having digitally-derived

1977-03-15

1979-05-08

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347CC, 340347M, 324 99D, H03K 1320

Patent

active

RE0299928

ABSTRACT:
An analog-to-digital converter of the ramp-integrator type utilizing a special technique to reduce errors due to offset voltages. The integrator first is ramped up and then back to a reference level, by sequential application of opposite-polarity reference signals. A digital determination of net offset error then is made by comparing the total time of ramp-up-and-back with a fixed time period set by a clock generator. During the subsequent conversion operation, integration of the analog signal is controlled in accordance with the amount of net offset error so as to provide a feed-forward error correction. Integration is always in the same direction away from zero for analog signals of either polarity, thus avoiding the effects of discontinuity around zero input.

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patent: 3828347 (1974-08-01), Sacks et al.
R. Vautier, Differential Triple-ramp Converter, IBM Technical Disclosure Bulletin, vol. 15, No. 7, Dec. '72, p. 2053.
Dusan Velasevic, Drift Elimination in Integrating A to D Converters, Electronic Engineering, Mar. 1970, vol. 42, No. 505, pp. 49-51.

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