Mixed signal integrated circuit, with built in self test and method
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United States of America Patent
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Feb 25, 2014
Grant Date -
Jul 28, 2011
app pub date -
Nov 3, 2010
filing date -
Jan 26, 2010
priority date (Note) -
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Abstract
A mixed signal integrated circuit includes a signal source to inject a test signal into the signal path of the mixed signal integrated circuit, a feedback loop and a signal comparator for determining characteristics of a resulting signal. Conveniently, the test signal may be a digital signal injected upstream of a digital to analog converter (DAC). By connecting the output to the input, the entirety of the signal path and the majority of the integrated circuit may be tested. The signal may be condition or manipulated in the feedback loop. By incorporating test signal generation and measurement into the mixed signal integrated circuit, the cost of test equipment and the test duration for each device under test may be reduced.
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