System for sweeping a phase lock loop into lock with automatic i

Details System for sweeping a phase lock loop into lock with automatic i System for sweeping a phase lock loop into lock with automatic i

1998-02-10

2000-02-29

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 17, 331DIG2, 331176, 331 66, H03L 712

Patent

active

060314273

ABSTRACT:
A phase locked loop ("PLL") 28 containing apparatus for automatically causing the PLL to achieve phase lock when first energized or after having lost phase lock. In addition to a phase detector 4, loop filter 13, voltage controlled oscillator ("VCO") 14 and feedback from the VCO to the phase detector 16, the PLL has a sweep circuit 30. The sweep circuit cooperates with the loop filter when the PLL is not in phase lock to automatically generate a control voltage for the VCO which control voltage increases linearly with time until the PLL achieves phase lock or until the control voltage has reached the largest voltage in the dynamic input range of the VCO. In the event that phase lock is not achieved during the period of the increasing voltage, the control voltage decreases linearly with time to drive the PLL into phase lock.

REFERENCES:
patent: 4077015 (1978-02-01), Carson et al.
patent: 5576666 (1996-11-01), Rauvola

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