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For good DC accuracy what is wrong with a differential amp and a sense resistor?

April 26, 2017AMP dc Differential good Resistor sense wrong

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For good DC accuracy what is wrong with a differential amp and a sense resistor?

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At DC, that approach can work quite well, but even the most expensive differential amps lose their CMR rapidly at higher frequencies. In many topologies, there is no way around needing more CMR than conventional differential amplifiers can provide.