Analytical method to determine optimal out-of-band gain in multi-bit delta-sigma modulator

IEICE Electronics Express

Awinash Anand¹  Haruichi Kanaya¹  Ramesh K. Pokharel²  Keiji Yoshida¹  Nischal Koirala¹ 

[1] Graduate School of Information Science and Electrical Engineering, Kyushu University;EJUST-Center Kyushu University

关键词: analog-to-digital conversion;    continuous-time delta-sigma modulator;    feedforward;    excess loop delay;   

DOI  :  10.1587/elex.9.1598

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(6)A simple, systematic and deterministic MATLAB simulation which employs Risbo method and analytical simulation is proposed to determine the optimal out-of-band gain to achieve a maximal SNR and the maximum stable amplitude in a multi-bit delta-sigma modulator. Using the proposed method, a 128MS/s, 2MHz signal bandwidth 4th order 2-bit continuous-time delta-sigma modulator is designed and implemented in 0.18µm CMOS technology to verify the concept. As a result, the modulator achieves a peak SNDR of 79.3dB and a dynamic range of 83dB for a 2MHz signal bandwidth (OSR = 32) while consuming only 7.8mW from 1.8V supply.

【 授权许可】

Unknown