A Robust 3>sup/sup<Order Low-Distortion Multi-bit Sigma-Delta Modulator with Reduced Number of Op-amps for WCDMA

K. Chio, S.-P. U, R.P. Martins
2005 IEEE International Symposium on Circuits and Systems  
This paper describes a novel single-loop multi-bit (3 bits) sigma-delta modulator (SDM) with reduced number of op-amps for wideband WCDMA. Such architecture is based in a simplified analog structure that not only features low distortion but also provides an aggressive and significantly enlarged noise shaping bandwidth with low over-sampling ratio (OSR). With a sampling frequency of 39MHz and an OSR of 10 the proposed circuit can achieve 74dB SFDR. I. 0-7803-8834-8/05/$20.00 ©2005 IEEE.
doi:10.1109/iscas.2005.1465283 dblp:conf/iscas/ChioUM05 fatcat:tbnwv5lbhzbg7ntlhjuqgrgdhy