Phase lock detector

Details Phase lock detector Phase lock detector

1995-03-15

1998-03-31

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By pulse width or spacing

327159, 331DIG2, H03L 706

Patent

active

057342733

ABSTRACT:
A phase lock detector for a digital phase locked loop frequency synthesiser in which phase errors, represented by phase error pulses of a duration equal to the relative time displacement of synthesised and reference waveforms in the phase locked loop, are compared with a predetermined time interval representing the maximum phase error acceptable in a phase-lock condition. A favourable result of the comparison may be required to persist for a predetermined time before a phase-lock indication is given, to avoid jitter or flicker of that indication in a near-lock situation.

REFERENCES:
patent: 3988696 (1976-10-01), Sharpe
patent: 3996481 (1976-12-01), Chu et al.
patent: 4290029 (1981-09-01), Streckenbach
patent: 5180933 (1993-01-01), Krzyzanowski

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