Phase comparing apparatus

Details Phase comparing apparatus Phase comparing apparatus

1978-05-08

1980-05-06

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

331DIG2, 331 25, 328133, 455260, H04B 106

Patent

active

042019451

ABSTRACT:
A lock detecting circuit of a phase locked loop, comprising a phase comparator for receiving a reference frequency signal and a signal being compared with the reference frequency signal, a charging/discharging circuit which is charge/discharge controlled responsive to the output of the phase comparator and either of the above described two signals, and a delay flip-flop responsive to the output of the charging/discharging circuit and in synchronism with the signal applied to the charging/discharging circuit for assuming one storing state for providing an output representative of the phase difference between the above described two signals.

REFERENCES:
patent: 3080533 (1963-03-01), Edwards
patent: 3521182 (1970-07-01), Stuex
patent: 3982190 (1976-09-01), Schaefer
patent: 3988696 (1976-10-01), Sharpe
patent: 4122405 (1978-10-01), Tietz et al.
Sharpe, A. C. "How Can You be Sure That Your PLL is Really Locked In?" EDN, Feb. 20/77, vol. 22, No. 4.

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