Band-selectable phase-locked loop

Details Band-selectable phase-locked loop Band-selectable phase-locked loop

1997-03-31

1999-07-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327147, 331 17, H03L 7107, H03L 718

Patent

active

059231963

ABSTRACT:
A PLL is provided which is capable of following an input frequency over an extensive range without incurring an increase in the size of circuit arrangement. The PLL 100 includes a band-selectable voltage-controlled oscillator, and a band selection controller. The band selection controller monitors a comparison output from a phase detector and an output from a low-pass filter to deliver a band selection signal, which switches an oscillation band of the voltage-controlled oscillator. Instead of using the band-selectable voltage controlled oscillator, a programmable frequency divider may be used, and its frequency division factor may be changed responsive to the band switching signal.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway et al.
patent: 5166641 (1992-11-01), Davis et al.
patent: 5475326 (1995-12-01), Masuda
patent: 5498998 (1996-03-01), Gehrke et al.
patent: 5534823 (1996-07-01), Kondou

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