A method for approximating a first signal having a first oscillation period within a quantized time interval using a second signal is provided. The second signal has a second oscillation period. The method includes calculating a phase offset of the first signal at at least one position within the quantized time interval. Further, the method comprises shifting the second signal within the quantized time interval until a phase offset of the second signal at the at least one position satisfies a quality criterion related to the phase offset of the first signal.