Fast switching phase-locked loop

Details Fast switching phase-locked loop Fast switching phase-locked loop

1997-01-28

1998-10-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327148, 327157, 375374, 331 17, H03D 324, H04L 2360

Patent

active

058217894

ABSTRACT:
A fast switching phase-locked loop that substantially reduces the response time and the noise is disclosed. The present invention includes a voltage-controlled oscillator, which generates an ac output signal whose frequency is proportional to a control signal. A divider is used to generate a division signal whose frequency is an integer division of the ac output signal. The present invention also includes a phase detector, which generates a detect signal proportional to a phase difference of the division signal and a reference signal, therefore making the frequency of the ac output signal be an integer multiple of the reference signal. A first filter is used to shape the overall response during a fore part of switching period by generating the control signal according to the detect signal, and the first filter is then prohibited during a later part of the switching period. A second filter is further used to shape the overall response during the later part of switching period by generating the control signal according to the detect signal, where the bandwidth of the first filter is larger than the bandwidth of the second filter.

REFERENCES:
patent: 5175729 (1992-12-01), Borras et al.
patent: 5740213 (1998-04-01), Dreyer

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