FRACTIONAL-N ADPLL WITH REFERENCE DITHERING

FRACTIONAL-N ADPLL WITH REFERENCE DITHERING

A fractional-N all digital phase locked loop (ADPLL) includes a randomly modulated delay having a triangular distribution to a frequency reference at an input of the fractional-n ADPLL to reduce spurious tones introduced by delta-sigma modulation of a frequency control word without requiring active...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Misselwitz, Kai Hendrik, Moehlmann, Ulrich
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Beschreibung
Zusammenfassung:A fractional-N all digital phase locked loop (ADPLL) includes a randomly modulated delay having a triangular distribution to a frequency reference at an input of the fractional-n ADPLL to reduce spurious tones introduced by delta-sigma modulation of a frequency control word without requiring active control or calibration. In some embodiments, a delay line generates the randomly modulated delay based on a uniformly distributed random number with a flat spectrum that is shaped by a high pass filter.