JSSC 2023第12期Clocking & PLLs65nm

A Temperature- and Aging-Compensated RC Oscillator With 1030-ppm Inaccuracy From

一种温度和老化补偿的RC振荡器，通过周期性锁定主振荡器频率到参考振荡器，实现长期稳定性。

65nm CMOS, 100MHz, 5.1ps rms抖动, 1.4µW/MHz

RC振荡器温度补偿老化补偿长期稳定性电迁移

▸创新点1：使用高激活能量电阻（电路创新）。通过选用高激活能量（Ea）电阻，显著提升了振荡器的温度稳定性，减少了电阻值随温度变化的漂移，从而改善了整体频率精度。

▸创新点2：切换双RC分支以减少电迁移应力（电路创新）。采用双RC分支切换技术，有效降低了直流电流引起的电迁移（EM）应力，延长了电路的使用寿命并提高了长期稳定性。

▸创新点3：占空比循环减缓参考振荡器老化速率（系统创新）。通过引入占空比循环技术，减少了参考振荡器的持续工作时间，从而减缓了其老化速率，确保了长期频率补偿的准确性。

▸创新点4：周期性频率锁定技术（系统创新）。通过周期性将主振荡器频率锁定到参考振荡器频率，实现了对主振荡器长期漂移的补偿，进一步提升了系统的长期稳定性，最终实现了±1030 ppm的频率精度。

Abstract

This article presents a temperature- and aging- compensated RC oscillator (TACO) in which the long-term drift of the main oscillator is compensated by periodically locking its frequency to that of the less-aged reference oscillator. To improve the long-term stability of the TACO, it employs techniques, such as the use of higher activation energy ( Ea) resistors, switched dual RC branches to mitigate stress from dc-current-induced electromigration (EM), and duty cycling to slow down the aging rat