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A robust 3/sup rd/ order low-distortion multi-bit sigma-delta modulator with reduced number of op-amps for WCDMA
Kin-Sang Chio; Seng-Pan U; Martins, R.P.;
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
23-26 May 2005
Page(s):3099
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3102 Vol. 4
Abstract:
This paper describes a novel single-loop multi-bit (3 bits) sigma-delta modulator (SDM) with reduced number of operational amplifiers for wideband WCDMA. Such an architecture is based on a simplified analog structure that not only features low distortion but also provides an aggressive and significantly enlarged noise shaping bandwidth with low oversampling ratio (OSR). With a sampling frequency of 39 MHz and an OSR of 10 the proposed circuit can achieve 74 dB SFDR.
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