Mixers are analysed as a linear periodic time-vary- ing(LF\"TV) system with the large LO signal excitation and without a small-signal excitation. Efficient simula-tion of the mixed-signal substrate coupling is possible using macromodels of RF circuits. The substrate noise is added as a small signal disturbance via a coupling con-tact. A technique using a simple and systematic engineer- ing approach to analyse the impact of the substrate coupling in mixed-signal RF CMOS mixer is presented.
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