Design of multiple-input phase-locked oscillator in mutually synchronised system

The multiple-input phase-locked oscillator used as the clock source of each office in mutually synchronised systems should be designed to obtain a compromise between several conflicting requirements. The stability of the system is needed, although the phase difference between offices should be small, and fast responses to large changes in system parameters are needed, although jitter reduction is required. The letter gives the optimum design parameter to provide a compromise between these requirements. Two schemes for a stabilised variable-frequency oscillator are proposed, together with the results of an experiment which obtained an overall stability of 0.5×10¿7.