Patent ID: 7501899

Claim:
A method of generating a desired signal having a desired frequency equal to a product of a reference frequency of a reference signal times a real number comprising an integer part and a decimal part, the method comprising: cyclically performing a succession of a measurement phase and of a correction phase; the measurement phase comprising an integer division of a frequency of an output signal of an oscillator by a divider so as to obtain an intermediate signal, a determination of measurement signals, responsive to a controller, representative of a time mismatch between the intermediate signal and the reference signal having the reference frequency, and a transfer of electric charge dependent on a reference period of the reference signal, and on the integer part and on the decimal part of the real number so as to obtain an error signal representative of a time mismatch between a current output signal period of the oscillator and a desired period based on the desired frequency of the desired signal; the correction phase comprising a deactivation of the divider and a correction of the oscillator based on the error signal; and the output signal from the oscillator defining the desired signal.