The response of a ring oscillator to radio-frequency interference on the power supply includes a frequency shift and jitter. This paper shows that under certain conditions, the interference of one phase on the supply can lock the ring oscillator—the frequency of the oscillator does not shift as the interference amplitude is increased. A theoretical framework is developed to calculate the locations of the locking ranges. Both transistor-level simulations and board-level measurements are performed to confirm the locking phenomenon. Some unique properties of the locking are demonstrated. First, multiple locking ranges exist. Second, the gate-level locking mode dominates the locking mechanism. Third, the locking strength is proposed to characterize the difference of the locking ranges. Fourth, the locking dynamics are analyzed and summarized by studying the evolution of the gate delay. Finally, three types of interferences in addition to sinusoidal interference are found able to lock the ring oscillator under the same gate-level locking mode.

环形振荡器对电源射频干扰的响应包括频移和抖动。这篇论文表明，在一定条件下，电源上的一相干扰可以锁定环形振荡器——振荡器的频率不会随着干扰幅度的增加而发生变化。开发了一个理论框架来计算锁定范围的位置。执行晶体管级模拟和板级测量以确认锁定现象。展示了锁定的一些独特属性。首先，存在多个锁定范围。其次，门级锁定模式在锁定机制中占主导地位。第三，提出锁定强度来表征锁定范围的差异。第四，通过研究门延迟的演变，对锁定动力学进行了分析和总结。最后，发现除了正弦干扰之外的三种类型的干扰能够在相同的门级锁定模式下锁定环形振荡器。