文档介绍：TH03-3
Analysis ofNonlinear Distortion in Direct Sampling Mixers
Masaki Ishii and Kiyomichi Araki
Tokyo Institute of Technology, Meguro, Tokyo, 152-8552, Japan
ishii-
Abstract - Recently, improvement of CMOS process has changing a rotation capacitor. DSM can acquire a desired
made reconfigurable, single-chip digital transceiver possible. In decimation ratio and filter characteristic of changing
a digital transceiver, Direct Sampling Mixer (DSM) is a circuitry
that performs down-conversion, filtering, and decimation. frequency at local oscillator (LO) and capacitor rato between
Conventionally, an analysis of DSM has been treated by CH and CR. For this reason, discrete-time receiver with DSM
replacing each procedure into linear filters. However, because is suitable for SDR receiver. However, discrete-time receiver
DSM has a nonlinear characteristic for its amplifier and switch, is different from conventional continuous-time receiver.
detail analysis can't be achieved by linear analysis. In this paper, Discrete-time system essentially needs for the switch that
we consider the nonlinear characteristic of DSM and show the
simulation results of nonlinear distortion; AM/AM and EVM. converts continuous domain lnto discrete domain. Thereby, a
Index Terms - Direct Sampling Mixer, Nonlinear-Distortion, signal may be distorted by usually di