Novel single-loop multi-bit sigma-delta modulator using OTA sharing technique without DEM

IEICE Electronics Express

Song Jia¹  Xing Zhang¹  Hongyi Li¹  Yuan Wang¹ 

[1] Key Laboratory of Microelectronic Devices and Circuits Institute of Microelectronics, Peking University

关键词: data converter;    sigma-delta modulator;    DAC mismatch shaping;    amplifier sharing;    GSM;   

DOI  :  10.1587/elex.8.2041

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(6)This paper presents a novel technique to shape feedback DAC mismatch without any extra digital elements inside the sigma-delta loop by inserting an analog integrator and an out-of-loop digital differentiator. To lower power dissipation, a novel triple integrator with low capacitor mismatch sensitivity of the delay paths is proposed. As a result, the SDM with three integrators is realized by only one OTA. The proposed topology, simulated at transistor level on 0.13µm CMOS process, achieves 98.4dB SNDR with 100kHz bandwidth and 1.2mW power dissipation from a single 1.2V supply voltage. Its specification satisfies the GSM requirements.

【 授权许可】

Unknown