Dynamic voltage reference apparatus for A/D converters

Details Dynamic voltage reference apparatus for A/D converters Dynamic voltage reference apparatus for A/D converters

1984-06-22

1985-10-22

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

G08C 900

Patent

active

045491658

ABSTRACT:
When an A/D converter is converting a multilevel analog signal into a plurality of distinct digital words, it needs to have a very accurate reference voltage which is tied to the voltage levels of the analog signal being converted for high accuracy. The present invention takes the most significant bit and an error bit signal from the analog-to-digital converter and logically combines these signals in such a way that error feedback signals are generated which are integrated over the long term and used to adjust the reference voltages supplied to the analog-to-digital converter wherein the feedback error signals average to zero.

REFERENCES:
patent: 4186384 (1980-01-01), Acker
patent: 4295089 (1981-10-01), Cooperman
patent: 4364006 (1982-12-01), Makabe et al.
patent: 4384278 (1983-05-01), Benjamin
patent: 4454500 (1984-06-01), Kato et al.

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