Coded data generation or conversion – Converter calibration or testing
Patent
1993-06-30
1994-07-26
Williams, Howard L.
Coded data generation or conversion
Converter calibration or testing
H03M 110
Patent
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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Guzinski Miroslaw
Lewandowski James L.
Velasco Victor J.
Wu Shianling
AT&T Bell Laboratories
Levy Robert B.
Williams Howard L.
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