Enhancement of locking range through reactive loading on the feedback path

Coupled oscillator systems require oscillators with properties that heretofore have not been addressed in oscillator design. Specifically, one needs to achieve wide locking bandwidth - the counterpart to low Q if the oscillator is based on a resonant circuit. This letter introduces an approach to design of wide locking bandwidth by dealing with oscillator design in a feedback format. The specific realization reported here employs a MMIC amplifier with transmission line feedback external to the MMIC. Reactive loads that are weakly coupled to the transmission line allow one to achieve wide locking bandwidth. Results for an implementation at K/sub (alpha)/ band are provided.