Circuit and method for faster frequency switching in a phase...

Details Circuit and method for faster frequency switching in a phase... Circuit and method for faster frequency switching in a phase...

2006-10-31

2006-10-31

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S17700V, C331S034000, C331S175000

Reexamination Certificate

active

07129791

ABSTRACT:
A PLL circuit arrangement includes a first frequency divider connected to a reference frequency source, a second frequency divider connected to the output of an oscillator controlled by the output of a loop filter, a phase/frequency detector that detects phase/frequency differences between the two divider outputs, a charge pump between the detector and the loop filter, a controller providing a changeable divider ratio to the first and/or second frequency divider, and a regulating signal generator that changes the output voltage of the loop filter applied to the oscillator in a controlled manner in response to a change of the divider ratio. The signal generator preferably has inputs connected to outputs of the controller and the frequency dividers, and an output connected to the charge pump and/or the loop filter to accelerate the recharging thereof in response to a change of the divider ratio.

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