Mismatching between the MOS transistors in a current mirror causes harmonic distortion. In a complementary class AB current mirror, mismatching of threshold voltages, geometries and transconductance parameters causes a distortion which cannot be eliminated by circuit techniques but which can be reduced by careful device matching. The author presents a worst case estimate of the harmonic distortion introduced by device mismatch.
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Erik Bruun (1998) studied this question.
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