Subranging analog-to-digital converter with digital error correc

Details Subranging analog-to-digital converter with digital error correc Subranging analog-to-digital converter with digital error correc

1988-03-28

1990-02-20

Shoop, Jr., William M.

Coded data generation or conversion

Converter calibration or testing

341118, 341155, 36457105, H03M 110

Patent

active

049030230

ABSTRACT:
An analog-to-digital converter having error correction in the digital stages of the converter. A calibration microprocessor executes a correction value program prior to, or interspaced with, the normal operation of the converter. From either of two calibration programs, appropriate digital correction values are stored into a digital memory. The analog input signal is converted to a digital signal by a main range analog-to-digital converter, with the output of the converter addressing the memory containing the error correction values. The main range digital value is reconverted to an analog signal which is compared to the original input signal to determine the difference therebetween. This analog difference is converted to a digital signal and combined with the main range digital signal and the addressed correction values to produce the digital output signal of the conversion system.

REFERENCES:
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patent: 4544917 (1985-10-01), Lenhoff
patent: 4612533 (1986-09-01), Evans
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patent: 4804960 (1989-02-01), Fernandes et al.
patent: 4814767 (1989-03-01), Fernandes et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-54 to I-59, II-64 and II-65; III-80 to III-83.

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