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A 200-μW Interface for High-Resolution Eddy-Current Displacement Sensors Matheus
一种基于数字锁相环的低功耗涡流位移传感器接口，实现6.7 nm分辨率。
200 µW, 1.8-V, 6.7 nm (rms), 3-kHz bandwidth
涡流传感器数字锁相环低功耗位移测量电容DAC
▸采用数字锁相环（DPLL）将金属目标位移转换为数字信息
▸使用数字控制振荡器（DCO）和电容DAC实现频率锁定
▸无需参考线圈，通过电容DAC补偿线圈电感公差
Abstract
This article presents a low-power eddy-current
sensor interface for touch applications. It is based on a bang-bang
digital phase-locked loop (DPLL) that converts the displacement
of a metal target into digital information. The PLL consists of
a digitally controlled oscillator (DCO) built around a sensing
coil and a capacitive DAC, a comparator-based bang-bang
phase/frequency detector (PFD), and a digital loop filter (DLF).
The PLL locks the DCO to a reference frequency, making its
digital input a