A simple and comprehensive study of the high-frequency harmonic distortion of two-stage Miller-compensated CMOS OTAs used in inverting configuration is presented. An improved extension of a symbolic approach recently proposed by the authors is adopted here. As a result of a better formalisation, inaccuracies incurred by the original formulation can be avoided and closed-form expressions of second- and third-order harmonic distortion factors are derived, whose precision extends well beyond the amplifier's gain-bandwidth product. The correctness of both this approach and the expressions derived was confirmed by comparison with computer simulations at transistor level.
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Cannizzaro et al. (2005) studied this question.
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