Method and apparatus for all code testing

Coded data generation or conversion – Converter calibration or testing

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H03M 110

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active

053329961

ABSTRACT:
A device (12), such as an A/D converter for generating successive codes, each in accordance with the level of an input analog voltage, may be tested to determine if all codes have been generated by applying a voltage V.sub.t having an amplitude that varies between 0 and V volts. The variation in the voltage V.sub.t is such that when the device (12) is operating properly, it will generate all of its codes during a predetermined interval. Each code generated by the device (12) is compared by a comparator (18) to the count of an n-bit counter (20) whose count is initialized at zero. Each time the count of the counter (20) matches the code produced by the device (12), the counter is incremented. If the counter overflows (i.e., its count has exceeded 2.sup.n -1) within a prescribed interval, then the device (12) is said to be operating properly.

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patent: 5132685 (1992-07-01), DeWitt et al.
Havener, Catch Missing Codes, Electronic Design 16, Aug. 11975, pp. 58-64.
Sellier, Analog-to-Digital Converter Automatic Tester, IBM Technical Disclosure Bulletin vol. 22 No. 3 Aug. 1979, pp. 1039-1040.

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