The 3-op-amp instrumentation amplifier offers a c.m.r.r. advantage over a single-op-amp differential amplifier only under specific conditions.
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Circuit designers should not default to 3-op-amp topologies for CMRR gains; leaves open case-specific analysis of matching conditions.
The c.m.r.r. performance of the 3-op-amp instrumentation amplifier is analysed and shown to be, in general, no better than that of a single-op-amp differential amplifier. Only under rather special conditions does the more elaborate amplifier have a c.m.r.r. advantage.
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Smither et al. (1977) studied this question.
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