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Interleaved analog to digital converter with digital equalization

  • US 8,537,044 B2
  • Filed: 12/28/2012
  • Issued: 09/17/2013
  • Est. Priority Date: 12/28/2011
  • Status: Active Grant
First Claim
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1. An interleaved analog to digital converter with digital equalization, comprising:

  • A. a conversion-measurement-equalization unit having;

    i. an analog input, that is used as analog input of the interleaved analog to digital converter with digital equalization, a digital output, that is used as digital output of the interleaved analog to digital converter with digital equalization,ii. a measured frequency responses output, a corrected frequency responses input andiii. an equalizer coefficients output, said conversion-measurement-equalization unit being able to work in a calibration mode or an operational mode, wherein in the operational mode the conversion-measurement-equalization unit converts the input analog signal into a digital signal by the use of a interleaved composite ADC consisting of N sub-ADCs, corrects sub-ADCs misalignment as well as the deviations from target frequency responses by the use of a digital equalizer and puts equalizer output signal at the digital output of the conversion-measurement-equalization unit, whereas in the calibration mode said conversion-measurement-equalization unit performs frequency responses measurement of each sub-ADC and yields the measurement results on the measured frequency responses output, transforms the corrected frequency responses received at its corrected frequency responses input into a set of equalizer coefficients, puts them at the equalizer coefficients output and loads the coefficients into digital equalizer memory;

    B. a residual distortions reduction unit having;

    i. a measured frequency responses input connected to the measured frequency responses output of the conversion-measurement-equalization unit,ii. an equalizer coefficients input connected to the equalizer coefficients output of the conversion-measurement-equalization unit andiii. a corrected frequency responses output connected to the corrected frequency responses input of the conversion-measurement-equalization unit, wherein said residual distortions reduction unit uses received measured frequency responses and equalizer coefficients as a base to calculate the corrected frequency responses, the calculations being performed as a set of successive iterations.

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