Abstract

Low frequency noise in active mixers of direct conversion receivers (DCR) can compromise overall receiver sensitivity. In this paper, A qualitative quasi-analytical model has been developed to in-depth explain the flicker noise mechanisms in the switched-gm active mixer. The model simply explains how frequency translations take place within the mixer. Compact equations are derived to estimate the flicker noise contribution of individual stages at the output. Simulations validate the accuracy of the predictions, and the dependence of flicker noise on local oscillator (LO) slope ratio, period, and other circuit parameters.

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