Extended frequency range relaxation oscillator with improved...

H - Electricity – 03 – K

Patent

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H03K 3/0231 (2006.01) H03K 3/282 (2006.01)

Patent

CA 2283892

A relaxation oscillator, such as a voltage controlled oscillator (VCO), with automatic swing control feedback which dynamically monitors the voltage swing across a capacitor and adjusts the oscillator threshold voltage, at which reversal of the polarity of the charging/discharging current occurs, to maintain the effective voltage swing at a constant level. The improved relaxation oscillator provides a very wide linear range of frequency variation versus control voltage (or current) and allows for the extendibility of linear operation to or near the maximum frequency that can be practically achieved by the oscillator circuitry.

L'invention se rapporte à un oscillateur à relaxation, tel qu'un oscillateur commandé en tension (VCO), présentant une rétroaction sur la commande automatique de l'excursion, rétroaction qui contrôle de manière dynamique l'écart de tension dans un condensateur et règle la tension seuil de l'oscillateur. On applique à cet oscillateur un renversement de polarité du courant de charge/décharge en vue de maintenir l'écart de tension effectif à un niveau constant. L'oscillateur à relaxation perfectionné assure une très large plage linéaire de variations de fréquence par rapport à une tension (ou un courant) de commande et permet l'extension du fonctionnement linéaire jusqu'à ou au voisinage de la fréquence maximale qui peut être atteinte, dans la pratique, par les circuits de l'oscillateur.

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