Fast locking variable frequency phase-locked loop

Details Fast locking variable frequency phase-locked loop Fast locking variable frequency phase-locked loop

1996-08-19

1998-05-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 17, 331 18, 331 57, 327105, 327156, 327157, 360 51, 455260, H03L 718

Patent

active

057572380

ABSTRACT:
According to the preferred embodiment of the present invention, a phase-locked loop is provided that overcomes the limitations of the prior art by facilitating fast locking on transition to a different output frequency. The phase-locked loop comprises an oscillator that provides a phase-locked loop output signal at various selected frequencies; a feedback divider; a phase comparator; a memory storage mechanism for storing phase-locked loop control information corresponding to selected output frequencies; and a digital circuit mechanism that receives the control information from the memory storage mechanism on transition to a different output frequency. The control information includes a digital counter value corresponding to the last recorded phase difference of the output signal at the different output frequency. On transition, this information is loaded directly to the digital circuit mechanism, reducing the need and time required for the phase comparator operation to drive the PLL to lock. Thus, the phase-locked loop can quickly achieve phase lock at the different operating frequency.

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