Synthesising a sine wave

H - Electricity – 03 – B

Patent

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Details

H03B 28/00 (2006.01) H03B 23/00 (2006.01) H03B 21/00 (2006.01)

Patent

CA 2334975

A method and apparatus for synthesising an approximation to a sine wave comprising generating a number of pulse width modulated signals, each having a predetermined duty cycle and being the same frequency as each other, from a clock signal. The generated pulse width modulated signals are then combined to produce an approximation to a sine wave having the same frequency as the pulse width modulated signals. The clock signal is provided by an oscillator arranged to produce clock signals over continuous range of frequencies so that approximations to a sine wave can be produced over a continuous range of frequencies.

L'invention porte sur un procédé et un appareil de synthétisation d'une approximation à une onde sinusoïdale, ce procédé consistant à générer, à partir d'un signal d'horloge, un nombre de signaux modulés en largeur d'impulsions, chaque signal ayant un rapport cyclique prédéterminé et ayant la même fréquence. Les signaux à modulation d'impulsions en largeur générés sont ensuite combinés de façon à obtenir une approximation à une onde sinusoïdale ayant la même fréquence que les signaux à modulation d'impulsions en largeur. Le signal d'horloge est produit par un oscillateur destiné à générer des signaux d'horloge sur une plage continue de fréquences de sorte que les approximations à une onde sinusoïdale puissent être obtenues sur une plage continue de fréquences.

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