Patent ID: 8736474

Claim:
A delta-sigma modulator for converting an analog input signal to a digital output signal using delta-sigma modulation, said delta-sigma modulator comprising: a loop filter for processing the analog input signal, and a feedback signal related to the digital output signal, using summation and integration to generate a filtered signal; a noise coupler coupled to said loop filter for receiving the filtered signal therefrom, said noise coupler being operable to generate a noise coupled signal based on the filtered signal and the feedback signal, the noise coupled signal being obtained by coupling the filtered signal with a difference between the noise coupled signal itself and the feedback signal; a quantizer coupled to said noise coupler for quantizing the noise coupled signal from said noise coupler to generate the digital output signal; and a digital-to-analog converter coupled to said loop filter, said noise coupler and said quantizer, said digital-to-analog converter being operable to convert the digital output signal from said quantizer to an analog signal that serves as the feedback signal; wherein said noise coupler includes an amplifier having an inverting input terminal capable of receiving a difference between the filtered signal and the feedback signal, and a non-inverting output terminal for outputting the noise coupled signal, and a first capacitor coupled between said inverting input terminal and said non-inverting output terminal of said amplifier.