Voltage controlled oscillator

H - Electricity – 04 – L

Patent

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Details

H04L 7/033 (2006.01) H03L 7/099 (2006.01)

Patent

CA 2296420

The invention relates to a voltage controlled oscillator (VCO), for use in a phase locked loop for clock multiplication, for example in recovery of data pulses from a data stream input comprising digital data with unknown phase. According to the invention, the VCO comprises a plurality of VCO stages, each stage being implemented as a differential amplifier. The amplifier load is formed of two cross-coupled gate devices (M5 and M6) and of two gate devices (M8 and M9) which are connected as diodes. The differential input is applied to a source coupled input pair (M2 and M3) as well as to two pull-down gate devices (M4 and M7).

L'invention concerne un oscillateur commandé par variation de tension (VCO), destiné à être utilisé dans une boucle PLL de modulation de la synchronisation, par exemple, pour la récupération d'impulsions de données dans l'entrée d'un flux de données comprenant des données numériques de phase inconnue. Selon l'invention, le VCO comprend une pluralité d'étages VCO, chacun étant réalisé sous la forme d'un amplificateur différentiel. La charge de l'amplificateur est constituée de deux portes à couplage transversal (M5 et M6) et de deux portes (M8 et M9) montées en diodes. L'entrée différentielle est appliquée à une paire d'entrées (M2 et M3) couplée à une source, et à deux portes d'excursion basse (M4 et M7).

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