Abstract
In this paper the behaviour of a complementary nMOS–pMOS differential pair in the presence of RF interference superimposed on the input terminals is analysed. An intrinsic nonlinearity cancellation mechanism in this structure is demonstrated, and proper design criteria are presented to exploit this mechanism in order to achieve a very high immunity to RF interference. A high-immunity complementary differential pair has been employed as an input stage of a folded cascode operational amplifier and its improved behaviour in the presence of RF interference has been verified by computer simulations.
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