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A 09-V 28-MHz Highly Digital CMOS Dual- RC Frequency Reference With 200 ppm Inac
本文提出了一种用于无线传感器节点的高能效双RC频率参考，采用数字频率锁定环技术。
28-MHz, 0.9V, 142 μW, 7 ps period jitter, ±200 ppm inaccuracy
频率参考数字频率锁定环RC多相滤波器温度补偿低功耗
▸使用双RC多相滤波器生成温度无关的相位差
▸采用数字相位域ΣΔ调制器进行数字化处理
▸高度数字化架构实现低电压供电和高效能
Abstract
This article presents an energy-efficient dual- RC
frequency reference intended for wireless sensor nodes. It con-
sists of a digital frequency-locked loop (FLL) in which the
frequency of a digitally controlled oscillator (DCO) is locked
to a temperature-independent phase shift derived from two
different RC poly-phase filters (PPFs). Phase shifts with com-
plementary temperature coefficients (TCs) are generated by
using PPFs made from different resistor types (p-poly and
silicided p-poly). The phas