Abstract
The design of checkers aimed at the concurrent test of analog and mixed-signal circuits is considered in this paper. These checkers can on-line test duplicated and fully differential analog circuits. The test approach is based on exploiting the inherent redundancy of these circuits which results in the use of a code for the analog signals. The analog code is monitored by the checkers. An error signal which complies with existing digital self-checking parts is generated in the case that a code fails out of the valid code space. For the verification of the analog codes, absolute tolerance margins and tolerance margins which are made relative to signal amplitude are considered. A test pattern generator for off-line testing of the checkers is proposed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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