Better common-mode rejection

Common mode rejection is best obtained using a differential signal into common (matched) impedance. But what if the impedance source is inherently (and uncontrollably, at least by us) mis-matched? So we have to resort to thought/simulation and conisder the voltages generated (and dropped) by the various impedances in the circuits. If the impedances are poorly defined, we can’t hope to achieve very high rejetion ratios, but worthwhile rejection can still be achieved.

 

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