Phase locked loop

Details Phase locked loop Phase locked loop

1995-09-15

1996-07-23

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 12, 331 15, 331 20, 331 25, 331DIG2, 327159, 348536, H03L 706, H03L 7085, H03L 7095

Patent

active

055393578

ABSTRACT:
PLL apparatus for generating an oscillatory signal phase locked to a component of a further signal comprises a variable oscillator for generating the oscillatory signal and a source of the further signal. A phase detector responsive to the oscillatory signal and to the component of the further signal, provides a phase error signal which is coupled to the variable oscillator via a limiter. Circuit means are provided for controlling the limiting level of the limiter. The dual limiting substantially improves the loop noise tolerance and reduces the loop sensitivity to occasional phase reversals of the component of the further signal. Additional enhancements to loop stability and noise immunity are provided by an unlock detector which detects and totalizes phase rotations in a selected area of a phase plane and by a phase wrap detector which maintains a lock indication during phase angle wrapping.

REFERENCES:
patent: 5053724 (1991-10-01), Ogino et al.
patent: 5159292 (1992-10-01), Canfield et al.

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