Patent ID: 8760330

Claim:
An analog-to-digital converter for converting an input signal, the analog-to-digital converter comprising: a sigma-delta modulator configured to receive an analog modulator input signal and provide a digital modulator output signal; and an interference cancellation loop, comprising: a digital filter configured to amplify the digital modulator output signal in a frequency band, attenuate the digital modulator output signal outside the frequency band and a transition band surrounding the frequency band, and provide a filtered digital feedback signal; a digital-to-analog converter configured to convert the filtered digital feedback signal to a cancellation signal; and a signal combiner configured to combine the analog modulator input signal with the cancellation signal resulting in the analog modulator input signal, in order to at least partially cancel interference signal portions within the analog modulator input signal, wherein the interference cancellation loop comprises a digital replica of a signal transfer function of the sigma-delta modulator, wherein the digital replica is configured to receive the filtered digital feedback signal or a derived filtered signal, and provide an estimated response of the sigma-delta modulator in response to the digital filtered feedback signal or the derived filtered signal, wherein the estimated response is combined with the digital modulator output signal or a derived modulator output signal to provide an output signal of the analog-to-digital converter.