Noise Analysis of Direct Sampling Mixers

Abstract

Noise analysis of Direct Sampling Mixer (DSM) has been described in this paper. The output noise of the DSM is determined by the sum of continuous time noise and discrete time noise. The discrete time noise is calculated from the discrete time transfer function and Fourier transform of the sample/hold function. The input referred noise of the DSM is also derived and low noise design procedure is described. The simulation results of NF show good agreement between the theoretical calculations.