@article {9913224,
	title = {A 3.7mW 12.5MHz 81dB-SNDR 4th-Order Continuous-time DSM with Single-OTA and 2nd-Order Noise-shaping SAR},
	journal = {IEEE Open Journal of the Solid-State Circuits Society},
	year = {2022},
	pages = {1-1},
	abstract = {This paper presents a hybrid 4th-order delta-sigma modulator (DSM). It combines a continuous-time (CT) loop filter and a discrete-time (DT) passive 2nd-order noise-shaping SAR (NSSAR). Since the 2nd-order NS-SAR is robust against PVT variation, the stability of this 4th-order DSM is similar to that of a 2nd-order CT-DSM. The CT loop filter is based on single-amplifier bi-quad (SAB) structure. As a result, only one OTA is used to achieve 4th-order noise shaping, leading to a high power efficiency. Moreover, this work implements both excess loop delay (ELD) compensation and an input feedforward path inside the NS-SAR in the charge domain, further reducing the circuit complexity and the OTA power. Overall, this work achieves 81 dB SNDR over 12.5 MHz with 3.7 mW power, leading to a Schreier FoM of 176 dB.},
	issn = {2644-1349},
	doi = {10.1109/OJSSCS.2022.3212333},
	author = {Wei Shi and Liu, Jiaxin and Mukherjee, Abhishek and Yang, Xiangxing and Xiyuan TANG and Shen, Linxiao and Zhao, Wenda and Sun, Nan}
}
