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Feedforward delta-sigma modulator

  • US 9,035,814 B2
  • Filed: 07/16/2014
  • Issued: 05/19/2015
  • Est. Priority Date: 07/18/2013
  • Status: Active Grant
First Claim
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1. A feedforward delta-sigma modulator, comprising:

  • a successive approximation analog-to-digital converter comprising N+1 input terminals, and an output terminal for outputting a digital signal, wherein an input terminal of the N+1 input terminals is used for receiving an analog input signal, and N is a positive integer;

    a digital-to-analog converter coupled to the output terminal of the successive approximation analog-to-digital converter for receiving the digital signal, and generating an analog feedback signal accordingly;

    N integrators, wherein an output terminal of each integrator of the N integrators is coupled to a corresponding input terminal of the N+1 input terminals;

    a first adder coupled to the digital-to-analog converter for summing the analog input signal and the analog feedback signal to a first integrator of the N integrators;

    a second adder coupled to an input terminal of a Kth integrator of the N integrators, wherein an output terminal of the Kth integrator is coupled to an input terminal of a (K+1)th integrator of the N integrators, and K is a positive integer less than N; and

    an optimization zero generation unit coupled between the second adder and an output terminal of the (K+1)th integrator.

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