Questions tagged [vcm]

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Op Amp: signal measurement that is below its common mode input range

I was wondering, how is possible to use an op amp, which its common mode input voltage is (V-) + 0.2V to (V+) - 0.2V to measure signals as low as 10mV for example? I'm looking for an ...
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Measurement isolated loop with Op Amp

I'm trying to measure a voltage across an Rsense (R2) in a galvanic isolated loop that flows a current (4 - 20mA). My Op Amp has Vcm +20V. But I'm worried about the voltage in nodes B and A with ...