Lock detecting circuit for phase-locked loop frequency synthesizer
作者： Fumitaka Asami
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摘要: A phase-locked loop circuit comprising a reference oscillator (1), frequency divider (2) for dividing the output signal of oscillator, programmable (3), phase comparator (4) monitoring difference in between two dividers, lock detector (11) generating first which is pulse-shaped or rectangular when above-mentioned generated, and digital maintaining (100) converting into second directed current signal.
google.co.uk 参考文章(4)
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Dietrich H. Schaefer, Phaselock circuitry with lock indication ,(1975)
Wulf-Christian Streckenbach, Digital phase control circuit including an auxiliary circuit ,(1979)