Discussion
Why does an instrumentation amplifier's rejection depend on resistor matching?
Answer: A
If the two arms of the output differential stage are not in exact proportion, a signal common to both inputs no longer cancels and appears at the output as though it were a difference. Bias current and slew rate are set elsewhere, and the differential gain shifts only slightly. Because the rejection depends on a ratio of ratios, it is far more sensitive to matching than to absolute values, which is why matched resistor networks are sold for exactly this purpose. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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