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A 32-MHz 34- μW Temperature-Compensated RC Oscillator Using Pulse Density Modula
一种采用脉冲密度调制的32MHz 34μW温度补偿RC振荡器，通过双温度修调和电阻温度系数补偿实现高精度频率输出。
32MHz, 34μW, 530ppm精度, 8.4ppm/°C, 80ppm/V电压灵敏度, 2.5ppm艾伦方差, 1μW/MHz能效
RC振荡器温度补偿脉冲密度调制频率锁定环CMOS
▸使用脉冲密度调制技术控制并联电阻组合以补偿温度系数
▸仅需在两个温度点进行修调即可实现全温度范围稳定性
▸基于频率锁定环(FLL)架构实现低功耗高精度振荡
Abstract
Highly stable on-chip frequency references offer
the possibility of replacing crystal oscillators in many cost-
and form-factor-constrained applications. However, achieving
good frequency stability in a power-efficient manner across
process, voltage, and temperature variations possess many design
challenges. This article describes these challenges and presents a
method for improving the integrated RC oscillator’s frequency
accuracy by overcoming them. We show that the impact of
resistor temperatu