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Clinicians must verify CMRR definitions to avoid signal errors in bioelectric recordings; leaves open standardization of amplifier metrics in research.
Two different definitions of the common-mode rejection ratio for differential amplifiers are not clearly distinguished. These ratios may differ by orders of magnitude. When differential amplifiers are used to minimize common mode interference in bioelectric measurements, these two ratios should be carefully defined and their magnitudes determined experimentally.
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Robert L. Schoenfeld (1970) studied this question.
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