Phase locked loop with circuit for preventing sidelock

摘要: A side lock detector to prevent in coherent PSK demodulation. For demodulation purposes it is necessary recreate the carrier at receiver. This may be accomplished with a phase-locked loop. However, plural phase modulation input signal loop has energy bands spaced rate intervals from desired frequency as well frequency. To detect band lock, pass filter monitors output of The center equal and width very narrow. Only during will significant amounts filter. detected by simple diode or like. inhibit means provided, responsive detector, drive voltage controlled oscillator out condition.