Accumulator controlled prescaler in a phased locked loop

Details Accumulator controlled prescaler in a phased locked loop Accumulator controlled prescaler in a phased locked loop

2006-10-24

2006-10-24

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S165100, C455S180300, C375S373000, C375S376000

Reexamination Certificate

active

07127225

ABSTRACT:
A wireless local area network transceiver, an integrated circuit chip, a PLL (Phase Locked Loop) device and a method are provided that may reduce influences of switching noise. The frequency of an output signal of the PLL device is divided in a prescaler of the PLL device by a prescaler factor. The prescaler is operable in at least two modes with each mode having assigned a different prescaler factor. An accumulator is implemented in the PLL circuit for generating a mode switching signal for changing the mode of the prescaler. The generation of the mode switching signal is done by storing an accumulator value and processing a modulus function for updating the accumulator value. The provided technique may allow for reducing disturbances caused by switching the mode of the prescaler in the PLL circuit.

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