Injection and phase locking synchronisation circuit - has phase shifter to set phase controlled oscillator pull in region of phase locked loop at max.

摘要

The oscillator is brought within the pull-in range of its phase locked loop by injection synchronisation such that even with low synchronisation power the synchronisation bandwidth is as large as possible. An adjustable phase-controlled oscillator's pull-in region is set to a maximum value by the phase shifter (PS). The phase shifter (PS) is located between the output of the reference oscillator (RO) and one port of a three-port circulator (Z) connected to the free-running oscillator's (O) output and to the circuit's output terminal (Po).