Analog-to-digital converter
Abstract:
An analog-to-digital converter comprises a first quantizer arranged for yielding a first digital signal; an error signal generation block arranged for generating an error signal representative of a difference between an analog input signal and the first digital signal; an analog loop filter arranged for receiving the error signal; a second quantizer arranged for receiving an output signal of the analog loop filter and for outputting a second digital signal; a digital loop filter arranged for receiving the second digital signal and for providing an input signal to the first quantizer; and a recombiner block comprising a first recombination and a second recombination filter, and an adder circuit for adding outputs of the first and second recombination filters. The first and second recombination filters are selected to obtain an analog-to-digital converted output signal being less dependent on quantization noise caused by the first quantizer than a first digital signal.
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