School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
Sensors (Basel). 2018 Jul 3;18(7):2131. doi: 10.3390/s18072131.
This paper presents a reference-voltage regulator free successive-approximation-register analog-to-digital converters (SAR ADC) with self-timed pre-charging for wireless-powered implantable medical devices. Assisted by a self-timed pre-charging technique, the proposed SAR ADC eliminates the need for a power-hungry reference-voltage regulator and area-consuming decoupling capacitor while maintaining insensitivity to the supply voltage fluctuation. Fabricated with a 0.18-µm complementary metal⁻oxide⁻semiconductor (CMOS) technology, the proposed SAR ADC achieves a Signal To Noise And Distortion Ratio (SNDR) of 53.32 dB operating at 0.8 V with a supply voltage fluctuation of 50 mV and consumes a total power of 2.72 µW at a sampling rate of 300 kS/s. Including the self-timed pre-charging circuits, the total figure-of-merit (FOM) is 23.9 fJ/conversion-step and the total area occupied is 0.105 mm².
本文提出了一种无参考电压稳压器的自定时预充电逐次逼近寄存器模数转换器 (SAR ADC)，用于无线供电的植入式医疗设备。在自定时预充电技术的辅助下，所提出的 SAR ADC 消除了对耗电的参考电压稳压器和面积消耗的去耦电容器的需求，同时保持对电源电压波动的不敏感性。该 SAR ADC 采用 0.18-µm 互补金属氧化物半导体 (CMOS) 技术制造，在 0.8 V 的电源电压波动为 50 mV 时，实现了 53.32 dB 的信号噪声和失真比 (SNDR)，在 300 kS/s 的采样率下消耗的总功率为 2.72 µW。包括自定时预充电电路在内，总品质因数 (FOM) 为 23.9 fJ/转换步，占用的总面积为 0.105 mm²。
