Charge pump compensation techniques for sigma-delta fractional-N synthesizer
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United States of America Patent
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Issued Date -
Nov 16, 2006
app pub date -
May 11, 2005
filing date -
May 11, 2005
priority date (Note) -
Abandoned
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Abstract
A compensated fractional-N synthesizer has a voltage controlled oscillator providing a frequency output signal. The frequency divider divides the frequency output signal. It generates a frequency divider output divided signal. A frequency divider receives controlling signal from an adder receiving a fractional signal from a sigma-delta modulator and an independent integer number signal. A phase frequency detector compares a reference frequency signal with a frequency divider output divided signal outputting a phase frequency detector output to a charge pump. A loop filter for filtering a current provides filtered current to a voltage controlled oscillator. A charge pump provides current and a charge pump compensation means has a plurality of switch transistors providing an output signal to said charge pump. The charge pump compensation means receives the fractional signal from the sigma-delta modulator.
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