Further remarks on injection locking

There are two topics covered here. First, asymmetrical locking properties of an injection-locked oscillator (ILO) are dealt with. It is shown that these properties can be partly explained by the asymmetry in the phase response of the oscillator tuned circuit. Second, the Shaw-Stover´s locking figure of merit is briefly discussed. A general expression for the said figure is given. It can be used for optimization purposes when maximum locking figure of merit is the main goal of a particular design.