JAJSS97 December 2023 RES11A
PRODUCTION DATA
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The differential-input, differential-output instrumentation amplifier shown in Figure 8-3 has a common-mode gain of ACM = 1 V/V. The differential gain is described by the following (assuming an ideal amplifier):
Because the worst-case-stage CMRR occurs when the differential gain is lowest, and the common-mode gain is unity, the minimum CMRR is evaluated as:
For example, for an instrumentation amplifier with RES11A90, the worst-case CMRR is: