an analog to digital converter converts an analog signal to a digital signal . the adc includes an input channel , a sampling circuit coupled to the input channel , an integrator coupled to the sampling circuit , and a feedback circuit coupled to the integrator . the input channel receives the analog signal . the sampling circuit samples the analog signal . the integrator receives the sampled analog signal and a feedback signal and integrates a superposition of the sampled analog signal and the feedback signal . the feedback circuit generates the digital signal according to an output of the integrator and sends the feedback signal indicative of the digital signal to the integrator .