A 240μW 17bit ENOB ΔΣ modulator using 2nd-order noise-shaped integrating quantizer

IEICE Electronics Express

article

Kunyu Wang¹  Wenjing Xu¹  Chengbin Zhang¹  Man-Kay Law²  Li Zhou¹  Ming Chen¹  Jie Chen¹ 

[1] Institute of Microelectronics of the Chinese Academy of Science;University of Macau

关键词: analog-to-digital conversion;    ΔΣ modulator;    noise enhancement circuit;    noise-shaping quantizer;   

DOI  :  10.1587/elex.19.20220038

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

This paper presents a discrete-time (DT) 4th-order ΔΣ modulator using a 2nd-order noise-shaped integrating quantizer (NSIQ). By adding a passive finite impulse response (FIR) filter to the 1st-order NSIQ, the proposed quantizer has obtained 2nd-order noise shaping ability, without extra power consumption. By incorporating the digital integrator, the linearity requirement of the quantizer is relaxed. The proposed modulator is fabricated in a 0.18μm CMOS process, and operates at 1MS/s achieves a peak signal-to-noise-and-distortion ratio (SNDR) of 106.9dB in a 10kHz bandwidth while consuming 240μW with 1.8V power supply.

【 授权许可】

CC BY