Abstract: Apparatus for synchronizing an internally generated signal with an externally generated periodic or aperiodic signal to generate a periodic output signal phase synchronized with the externally generated signal comprising a local reference signal source, a sampling phase detector, a wide angle phase shifter, and a reference locked phase locked oscillator to achieve the phase alignment of the desired output signal to the input reference signal. The apparatus may contain an optional signal conditioner to condition the input reference signal for processing within the apparatus.