Fundamental, harmonic and subharmonic locking phenomena in negative-resistance oscillators

Using a simple nonlinear negative-resistance model for the active element of an oscillator, small-signal locking characteristics are investigated for fundamental, harmonic and subharmonic locking. For fundamental locking, a large-signal theory has been developed, and its results are compared with those of the well established small-signal theory for both reciprocal and circular injection of the locking signal.