Autocalibrated multistage A/D converter

Coded data generation or conversion – Converter calibration or testing

Patent

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Details

341118, 341156, 341161, H03M 106

Patent

active

049086219

ABSTRACT:
An autocalibrated multistage analog to digital converter precisely maintains appropriate error correction levels for each stage during operation of the converter to minimize quantization errors. An error signal is derived from the digital output of the converter based upon the slope of the input analog signal, determined either explicitly via hardware or implicitly via software, and an overflow/underflow condition. The error signal is fed back to a calibration control circuit to generate individual error correction levels for various variable correction devices within the analog to digital converter, such as a variable analog delay device. The variations from nominal established at calibration that are due to age, temperature or other environmental factors generate the error signal that varies from a nominal value and is fed back to alter the various error correction levels to minimize the error variation.

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H-P Journal, Nov. '82, Muto et al., "Designing a Ten-Bit, Twenty-Megasample-Per-Second Analog-to-Digital Converter System".
WESCON/82, 30/1, Sep. 14-16, '82, Kauffman, "Multistage Error Correcting A/D Converters".

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