A novel harmonic selection technique based on the injection of a periodically repeated oscillations train into an oscillator

A new concept based on the injection of a periodically repeated oscillations train into an oscillator is presented. It is based on a phenomenon named pseudo-locking, leading to a novel harmonic selection technique. Theoretical description of the concept is presented, in particular an analytical condition is carried out, paving the way of design rules. For a proof of concept, an oscillator fabricated on a 40 nm CMOS technology was measured. The concept was validated by measured phase noise equivalent to classical fundamental injection locking phase noise performance.