- A method of correcting intermodulation errors introduced by an conversion circuit adapted to convert an input analogue signal to an output digital signal, the method comprising the steps of: - providing the digital output signal, - generating a correction function, the correction function being a complex function of the digital output signal, and - correcting the digital output signal using the correction function to obtain a corrected digital output signal, the correction function being linearly dependent on the instantaneous frequency of the digital output signal, the corrected digital output signal being equal to the difference between the digital output signal and the product of the digital output signal and the correction function, the step of generating the correction function comprising the implementation of at least one set of steps, each set of steps being selected from the group consisting of a first set of steps, a second set of steps and a third set of steps, the first set of steps comprising the steps of: - calculating a first polynomial function of the square of the modulus of the digital output signal, to obtain a first final term, - calculating a second polynomial function of the square of the modulus of the digital output signal in a complex representation, to obtain a second intermediate term, - applying a filter to the digital output signal to obtain a filtered signal, - calculating the product of the second intermediate term and the product of the complex conjugate of the digital output signal and the filtered signal to obtain a second final term, and - calculation of the sum of the first final term and the second final term, to obtain the correction function, the second set of steps comprising the steps of: - applying at least one operation to the digital output signal to obtain a calculation signal, the correction step comprising applying the correction function to the calculation signal, and the third set of steps comprising the steps of: - applying a calibration signal to the conversion circuit, for example a signal with two distinct frequencies, - measuring the signal obtained at the output of the conversion circuit, to obtain a measured signal, and - analysing the spectral components of the measured signal. - providing the digital output signal, - generating a correction function, the correction function being a complex function of the digital output signal, and - correcting the digital output signal using the correction function to obtain a corrected digital output signal, the correction function being linearly dependent on the instantaneous frequency of the digital output signal, the corrected digital output signal being equal to the difference between the digital output signal and the product of the digital output signal and the correction function, the step of generating the correction function comprising the implementation of at least one set of steps, each set of steps being selected from the group consisting of a first set of steps, a second set of steps and a third set of steps, the first set of steps comprising the steps of: - calculating a first polynomial function of the square of the modulus of the digital output signal, to obtain a first final term, - calculating a second polynomial function of the square of the modulus of the digital output signal in a complex representation, to obtain a second intermediate term, - applying a filter to the digital output signal to obtain a filtered signal, - calculating the product of the second intermediate term and the product of the complex conjugate of the digital output signal and the filtered signal to obtain a second final term, and - calculation of the sum of the first final term and the second final term, to obtain the correction function, the second set of steps comprising the steps of: - applying at least one operation to the digital output signal to obtain a calculation signal, the correction step comprising applying the correction function to the calculation signal, and the third set of steps comprising the steps of: - applying a calibration signal to the conversion circuit, for example a signal with two distinct frequencies, - measuring the signal obtained at the output of the conversion circuit, to obtain a measured signal, and - analysing the spectral components of the measured signal. - calculating a first polynomial function of the square of the modulus of the digital output signal, to obtain a first final term, - calculating a second polynomial function of the square of the modulus of the digital output signal in a complex representation, to obtain a second intermediate term, - applying a filter to the digital output signal to obtain a filtered signal, - calculating the product of the second intermediate term and the product of the complex conjugate of the digital output signal and the filtered signal to obtain a second final term, and - calculation of the sum of the first final term and the second final term, to obtain the correction function, - applying at least one operation to the digital output signal to obtain a calculation signal, the correction step comprising applying the correction function to the calculation signal, and - applying a calibration signal to the conversion circuit, for example a signal with two distinct frequencies, - measuring the signal obtained at the output of the conversion circuit, to obtain a measured signal, and - analysing the spectral components of the measured signal.