Method and related device for generating a digital output signal corresponding to an analog input signal

A system, comprising:

• a first integrated circuit including
• an input node configured to receive an input signal in a first domain,
• a generator configured to generate a periodic signal in the first domain, said periodic signal having a main frequency and first tones which are harmonics of the main frequency,
• a combiner configured to combine the input and periodic signals into a resulting signal in the first domain,
• a converter configured to sample the resulting signal at a sampling frequency and convert the sampled resulting signal into a converted signal in a second domain, and
• a filter having a frequency response including zeroes at a plurality of second tones with passbands between adjacent second tones, said filter configured to remove frequency components of the periodic signal from the converted signal;
• wherein the main frequency is equal to an integer fraction of the sampling frequency of the converter and the harmonic first tones of the periodic signal are centered on ones of the second tones for the zeroes of the frequency response;
• and
• a second integrated circuit coupled to the first integrated circuit.

A method, comprising:

• generating an output signal in a first domain in response to a first input signal and a periodic second input signal, said periodic second input signal having a main frequency and first tones which are harmonics of the main frequency;
• converting the output signal from the first domain to a second domain by sampling the output signal at a sampling frequency;
• and
• removing frequency components of the periodic second input signal from the converted output signal by filtering with a filter having a frequency response including zeroes at a plurality of second tones with passbands between adjacent second tones;
• wherein the main frequency is equal to an integer fraction of the sampling frequency and the harmonic first tones of the periodic second input signal are centered on ones of the second tones for the zeroes of the frequency response.