Abstract
An unusual behaviour of a ring oscillator (RO) is described, namely the RF interference in the supply can lock the operational frequency of the RO. The lock is not an oscillator-level lock, but a gate-level lock. Transistor-level simulations are performed on various technologies. The locking phenomenon appears in all simulated cases and follows certain rules. Moreover, the model is also verified with an RO test board. In contrast to traditional injection locking, where the injection is applied to the signal pin of the oscillator, the locking behaviour introduced is caused by the injection in the supply. To the best of knowledge, this type of locking phenomenon has been reported and demonstrated for the first time.
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