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本文提出一种34µW功耗、32MHz频率的RC振荡器，采用脉冲密度调制技术，在-40°C至85°C范围内实现±530ppm的精度和80ppm/V的电源灵敏度。该设计解决了传统RC振荡器对温度和电源电压敏感的问题，实现了低功耗与高稳定性的结合。
University of Illinois, Urbana, IL Monolithic frequency references built using on-chip time constants are gaining popularity as possible replacements to bulky quartz-crystal or MEMS-based oscillators in low-cost applications. Among them, RC time-constant-based references [1-4] are most attractive because they occupy a small area, consume little power, and are well suited for integration in any standard CMOS process. But their performance is very susceptible to variations in temperature and supply voltage. Frequency-locked-loop(FLL)-based) closed-loop) RC oscillators [2-4], compared to open-loop relaxation oscillators, have higher immunity to voltage variations. However, their performance is also limited by the temperature dependence of the resistor. This limitation was addressed in the prior art by using a composite resistor made from resistors with opposing temperature coefficients (TCs) [2]. Unfortunately, the TC of the composite resistor is highly dependent on
Amr Khashaba, Junheng Zhu, Mostafa Ahmed, Nilanjan Pal, Pavan Kumar Hanumolu