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Synchronization and Tracking with Synchronous Oscillators,
FAIRCHILD COMMUNICATIONS AND ELECTRONICS CO GERMANTOWN MD
A Synchronous Oscillator SO is a coherent synchronization and tracking network in which an external signal forces the oscillator to be synchronized in frequency with a final phase difference determined by the initial frequency difference between the oscillator natural frequency and the external frequency. A SO acquires, tracks, filters, divides and improves the signal-to-noise ratio of the input signal in a single process. Most of the analyses in the literature, since the original work by Van der Pol, are based upon forced oscillation FO principle. In this operation the oscillator ceases to oscillate as soon as the external signal is applied to it. However, in the SO, the oscillations continue to exist after the application of the external signal. A SO has a very high skirt selectivity, approaching those of crystal filters or 60 dBOCT and a linear phase within its tracking band.
This article is from the Proceedings of the Annual Symposium on Frequency Control (37th), 1-3 Jun 83, Marriott Hotel, Philadelphia, Pennsylvania, AD-A136 673, p91-96.