Digital equalization of multiple interleaved analog-to-digital converters
First Claim
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1. A method for time variant interleaving equalization of an interleaved analog to digital converter comprising:
- converting a high-frequency analog input signal into a plurality of individual digital signals using a plurality of interleaved analog-to-digital converters;
interleaving the plurality of individual digital signals into a composite digital signal;
processing the composite digital signal in a time variant interleaving equalizer using a plurality of sets of equalizer coefficients;
wherein the time variant interleaving equalizer is synchronized with the interleaving of the plurality of individual digital signals into the composite digital signal; and
wherein during any sampling interval, when a certain sample of the composite digital signal is present at the time variant equalizer input, the synchronization of the time variant equalizer assures the identification of the individual digital signal that contained said sample before interleaving.
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Abstract
Time variant interleaving equalization of an interleaved analog to digital converter is disclosed. A high-frequency analog input signal is converted into a plurality of individual digital signals using a plurality of interleaved analog-to-digital converters. the plurality of individual digital signals are interleaved into a composite digital signal. The composite digital signal is processed in a time variant interleaving equalizer using a plurality of sets of equalizer coefficients.
43 Citations
13 Claims
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1. A method for time variant interleaving equalization of an interleaved analog to digital converter comprising:
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converting a high-frequency analog input signal into a plurality of individual digital signals using a plurality of interleaved analog-to-digital converters; interleaving the plurality of individual digital signals into a composite digital signal; processing the composite digital signal in a time variant interleaving equalizer using a plurality of sets of equalizer coefficients;
wherein the time variant interleaving equalizer is synchronized with the interleaving of the plurality of individual digital signals into the composite digital signal; andwherein during any sampling interval, when a certain sample of the composite digital signal is present at the time variant equalizer input, the synchronization of the time variant equalizer assures the identification of the individual digital signal that contained said sample before interleaving.
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2. A method for time variant interleaving equalization of an interleaved analog to digital converter comprising:
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converting a high-frequency analog input signal into a plurality of individual digital signals using a plurality of interleaved analog-to-digital converters; interleaving the plurality of individual digital signals into a composite digital signal; processing the composite digital signal in a time variant interleaving equalizer using a plurality of sets of equalizer coefficients;
wherein the time variant interleaving equalizer is synchronized with the interleaving of the plurality of individual digital signals into the composite digital signal; andwherein the synchronization of the time variant equalizer assures during a sampling interval the use of one of the plurality of the sets of equalizer coefficients that corresponds to one of the identified individual digital signals.
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3. A method for time variant interleaving equalization of an interleaved analog to digital converter comprising:
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converting a high-frequency analog input signal into a plurality of individual digital signals using a plurality of interleaved analog-to-digital converters; interleaving the plurality of individual digital signals into a composite digital signal; processing the composite digital signal in a time variant interleaving equalizer using a plurality of sets of equalizer coefficients;
wherein the time variant interleaving equalizer is synchronized with the interleaving of the plurality of individual digital signals into the composite digital signal;
wherein the sets of equalizer coefficients are prepared before the operation of the multiple interleaved analog to digital converter by using a calibration procedure; andwherein said calibration procedure comprising the steps of; measuring a comparative amplitude and group delay frequency responses of all individual digital signals; and calculating the sets of equalizer coefficients based at least in part on the measured comparative amplitude and group delay frequency responses. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A multiple interleaved analog to digital converter with digital equalization comprising:
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a calibration signal generator, having an output wherein the calibration signal generator is capable of outputting a sinusoidal signal; a selection switch, having two signal inputs and an output, wherein the first signal input is connected to a signal that is to be processed by the multiple interleaved analog to digital converter, and wherein the second signal input is connected to the output of the calibration signal generator; an anti-aliasing low-pass filter with an input and an output, wherein the input is connected to the output of the selection switch; an interleaving digitizer, having an analog input and a digital output, wherein the analog input is connected to the output of the anti-aliasing low-pass filter; a time variant equalizer, having a signal input, an equalizer coefficients input and an output, wherein the signal input is connected to the digital output of the interleaving digitizer and the output is used as an output of the multiple interleaved analog to digital converter; and a calibration measurement unit, having two inputs and an output, wherein the first input is connected to the digital output of the interleaving digitizer, the second input is connected to the output of the time variant equalizer, and the output of the calibration measurement unit is connected to the equalizer coefficients input of the time variant equalizer. - View Dependent Claims (10, 11, 12, 13)
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Specification