Sigma-delta based phase lock loop

Details Sigma-delta based phase lock loop Sigma-delta based phase lock loop

H - Electricity

03

D

H03D 3/24 (2006.01)

Patent

CA 2582345

A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PDF to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback signal. The charge pump to output a charge based on the output signals from the PFD. The charge pump including a first current source to apply a fixed amount of current and a second current source to apply a variable amount of current. The voltage controlled oscillator to output a clock signal based on the received charge from the charge pump.

L'invention concerne un dispositif à boucle à verrouillage de phase Sigma-Delta comprenant un détecteur de fréquence et de phase (PFD), une pompe de charge et un oscillateur contrôlé en tension. Le PDF sert à recevoir un signal de référence et un signal de rétroaction, et à émettre des signaux en fonction d'une comparaison entre le signal de référence et le signal de rétroaction. La pompe de charge sert à émettre une charge en fonction des signaux de sortie émis par le PDF, ladite pompe comprenant une première source de courant destinée à appliquer une quantité fixe de courant, et une deuxième source de courant destinée à appliquer une quantité variable de courant. L'oscillateur contrôlé en tension sert à émettre un signal d'horloge en fonction de la charge reçue de la pompe de charge.

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