← 返回 JSSC 论文列表JSSC 2020第9期Clocking & PLLs180nmVCO
A 161-bit Resolution 0064-mm² Compact Highly Digital Closed-Loop Single-VCO-Base
一种新型直接电阻传感器数字读出电路，采用单VCO和数字反馈环路，实现16.1位分辨率，面积仅0.064 mm²。
16.1位分辨率，171 µW功耗，0.064 mm²面积，-40°C至125°C工作范围
电阻传感器数字读出VCO噪声整形温度测量
▸创新点1：单VCO架构（电路创新）。该设计采用单一电压控制振荡器（VCO）实现高精度电阻传感器读取，显著减少了电路面积和功耗，同时通过闭环架构有效解决了VCO的非线性问题，实现了超过14位的线性度。
▸创新点2：二阶噪声整形（方法创新）。通过SMASH配置的第二环路实现了二阶噪声整形，显著提升了系统的信噪比，使得在1ms转换时间内达到16.1位有效分辨率（ENOB），同时功耗仅为171µW。
▸创新点3：高电磁干扰免疫（系统创新）。电路架构将传感器激励与反馈解耦，显著提高了传感器节点的电磁干扰（EMI）抗扰能力，适用于恶劣环境下的高精度测量。
▸创新点4：紧凑型设计（电路创新）。该电路在180nm CMOS工艺下仅占用0.064mm²面积，实现了高集成度和低功耗，能量效率达到2.4pJ/c.s. FOM，适用于便携式设备。
Abstract
A novel direct resistive-sensor-to-digital readout
circuit is presented, which achieves 16.1-bit ENOB while being
very compact and robust. The highly digital time-based archi-
tecture employs a single voltage-controlled oscillator (VCO),
counter, and digital feedback loop for the readout of an external
single-ended highly nonlinear resistive sensor, such as an NTC
thermistor. In addition to the inherent first-order noise shaping
due to the oscillator, the second loop in SMASH configuration
creates