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17 A Sub-nW Single-Supply 32-kHz Sub-Harmonic Pulse Injection Crystal Oscillator
一种基于次谐波脉冲注入技术的极低功耗32kHz晶体振荡器
55nm CMOS, 0.3V, 0.74nW
晶体振荡器次谐波脉冲注入低功耗实时时钟CMOS
▸次谐波脉冲注入技术降低功耗
▸50%占空比锁定环和次谐波峰值检测延迟锁定环确保精确时序
▸时钟分频器生成次谐波时钟
Abstract
An extremely low-power 32-kHz crystal oscillator
(XO) based on a sub-harmonic pulse injection technique is
presented. By injecting current pulses into the crystal at the sub-
harmonic of the oscillation frequency, the power consumption
of the proposed XO reduces with an increase in the order of
sub-harmonic ( N). For the generation of sub-harmonic pulses
with accurate timing, a 50%-duty-cycle-locked loop and a sub-
harmonic peak-detection delay-locked loop are employed. A clock
divider is also u