Two stage analog-to-digital conversion with second stage...

Details Two stage analog-to-digital conversion with second stage... Two stage analog-to-digital conversion with second stage...

2000-07-06

2010-06-08

Williams, Howard (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S156000

Reissue Patent

active

RE041371

ABSTRACT:
An analog to digital converter comprises a first stage for developing a set of most significant bits from an analog input signal and for producing analog residue signals (RA, RB) corresponding to respective differences between the analog input signal and threshold values directly above and below, respectively, the analog input signal, and a second stage (AMPA, AMPB, ADC2) for developing a set of lesser significant bits from the analog residue signals (RA, RB). According to the invention, the analog residue signals (RA, RB) are reversed (CA, CB). An offset detection unit (COD, DOD) coupled to the second stage (AMPA, AMPB, ADC2) retrieves offset data representative of offset errors, and an offset correction unit (AD1, AD2, OCA, OCB) corrects the offset errors on the basis of the offset data.

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Moon et al., Background Digital Calibration Techniques for Pipelines ADC's, IEEE Transactions on Circuits and Systems —II: Analog and Digital Signal Processing, vol. 44, No. 2, Feb. 1997, pp. 102-109.
“Background Digital Calibration Techniques for Piplined ADC's”, by Un-Ku Moon et al., IEEE Transactions on circuits and systems, vol. 44, No. 2, Feb. 1997.

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