Designing Phase-Locked Oscillators for Synchronization

Phase-locked oscillators (PLO´s) have two main areas of application: demodulation and synchronization. In this tutorial paper, a simplified approach to designing PLO´s for synchronization is described. In particular, some tradeoffs which can be made between such characteristics as capture range, jitter attenuation, time to lock, and phase offset are presented. As examples of this approach, the method is applied to three circuits in a Picturephone^®video coder-decoder (CODEC). The application of an optimum phase comparator is also described.