H. Kato, A DYNAMIC FORMULATION OF RING OSCILLATOR AS SOLITARY-WAVE PROPAGATOR, IEEE transactions on circuits and systems. 1, Fundamental theory andapplications, 45(1), 1998, pp. 98-101
A nonlinear model of the ring oscillator is proposed, The oscillations
are related to the irregularity or the kink-formed solitary wave, tha
t is, an elementary phenomenon in a nonlinear system, According to the
proposed model, we found that the higher harmonic generation cannot e
xist when the total number of stages is five or less.