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Delta-sigma analog-to-digital converter (ADC) having a serialized quantizer output

  • US 7,903,010 B1
  • Filed: 08/31/2009
  • Issued: 03/08/2011
  • Est. Priority Date: 08/31/2009
  • Status: Active Grant
First Claim
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1. An analog-to-digital converter, comprising:

  • a noise-shaping filter having an input for receiving an analog signal to be converted to a digital value;

    a quantizer having an input coupled to an output of the noise-shaping filter for generating quantized output values at a quantization rate of the quantizer, wherein the quantized output values are from a set of more than two output values;

    a digital-to-analog converter having an input for receiving the quantized output values and having an output coupled to an input of the noise-shaping filter for providing a feedback signal, wherein the noise-shaping filter, the quantizer and the digital-to-analog converter form a delta-sigma modulator loop; and

    a serial data circuit having an input coupled to an output of the quantizer for generating a serial bit stream representing the quantized output values, wherein a ratio of the bit rate of the serial bit stream to the quantization rate of the quantizer is greater than unity but less than a minimum number of bits required to represent the input of the digital-to-analog converter.

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