Comments, with reply, on ´Full 360 degrees phase shifting of injection-locked oscillators´ by X. Zhang and A. S. Daryoush

The commenters point out that when two fundamental locking mode injection-locked oscillators are cascaded together, they can easily provide 280 degrees plus phase shift. The total phase shift of the cascade oscillators is related to the overlapping locking region and is due to the phase shift accumulation in each suboscillator. A simple theory to explain the effect of cascading two suboscillators together is proposed, and a simple graphical model is suggested to explain the frequency-detuning-induced phase shift. X. Zhang and A. S. Daryoush, the authors of the above-titled paper (ibid., vol.3, no.1, pp.14-16, Jan. 1993) acknowledge the usefulness of the graphical technique but emphasize that great care must be taken in extending this fundamentally locked suboscillators graphical method to the harmonically related suboscillators presented. They clarify, the differences between the commenters´ approach and their own.<>