Patent ID: 8193959
Filing Date: 2012-06-05
Classification: H03M

Abstract:
1. An analog to digital converter (ADC) for converting an analog signal to a digital signal, said ADC comprising: an input channel receiving said analog signal; a first sampling-integrating unit, that receives said analog signal from said input channel, and that samples said analog signal, and that integrates a first superposition of a first feedback signal and a first sampled signal of said analog signal, and that generates a first output signal; a second sampling-integrating unit, that receives said first output signal, and that samples said first output signal, and that integrates a second superposition of a second feedback signal and a sampled signal of said first output signal, and that generates a second output signal, wherein each of said first and second sampling-integrating units comprises a first energy storage unit and a first switch array coupled to said first energy storage unit controlling said first energy storage unit; and a feedback circuit, coupled to said first and second sampling-integrating units, that generates said digital signal according to said second output signal, and that provides said first and second feedback signals indicative of said digital signal to said first and second sampling-integrating units respectively, wherein said second sampling-integrating unit comprises at a first error amplifier that compares a first reference signal with said second superposition of said second feedback signal and said sampled signal of said first output signal, and that generates a first error signal.