Interleaved analog to digital converter with digital equalization
First Claim
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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Abstract
An interleaved analog to digital converter with digital equalization includes a conversion-measurement-equalization unit and residual distortions reduction unit, and is operative in a calibration mode and converter mode. The conversion-measurement-equalization unit includes a composite ADC containing N sub-ADCs, equalizer, responses measurement unit and a coefficients calculator. The residual distortions reduction unit uses received measured frequency responses and equalizer coefficients, both from the conversion-measurement-equalization unit, as a base to calculate corrected frequency responses that are applied to the coefficients calculator for generation of equalizer coefficients for application to the equalizer. A residual distortions calculator of the residual distortions reduction unit, is responsive to measured frequency responses from the composite ADC and a current set of equalizer coefficients applied to the equalizer, to calculate residual frequency distortions that should have been expected to appear in the output signal of the ADC system if the current equalizer coefficients remain applied to the equalizer.
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Citations
4 Claims
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1. An interleaved analog to digital converter with digital equalization, comprising:
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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 and iii. 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 and iii. 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. - View Dependent Claims (2, 3, 4)
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Specification