Linear Distortion Correction Method for Time-Interleaved Analog-to-Digital Converter Based on Polyphase Decomposition

An analog-to-digital converter and polyphase decomposition technology, applied in analog/digital conversion calibration/testing, analog/digital conversion, code conversion, etc. Good effect, low complexity, low work speed requirements

Active Publication Date: 2019-04-05
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the method of correction in the digital backend also has some problems, such as high complexity, etc.
In addition, most digital back-end correction methods must target specific error types, such as gain error, time error, etc., which limits the performance improvement of the correction system

Method used

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  • Linear Distortion Correction Method for Time-Interleaved Analog-to-Digital Converter Based on Polyphase Decomposition
  • Linear Distortion Correction Method for Time-Interleaved Analog-to-Digital Converter Based on Polyphase Decomposition
  • Linear Distortion Correction Method for Time-Interleaved Analog-to-Digital Converter Based on Polyphase Decomposition

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Experimental program
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Embodiment 1

[0055] Such as Figure 9 Shown, the method provided by the invention comprises the following steps:

[0056] The first step is to confirm the number of channels M of the time-interleaved analog-to-digital converter and the transfer function H of the nth channel n (jω), let Hn (jω) is expressed as:

[0057]

[0058] in is the error parameter factor, p represents the transfer function H n Order of (jω), (jω) p Indicates the frequency response of the p-order differentiator, p=1...P;

[0059] make Indicates the frequency response of the p-order differentiator, then formula (1) can be further expressed as:

[0060]

[0061] The second step is to write the transfer function of M channels as a column vector form:

[0062]

[0063] in

[0064] The third step is to design a 1-P order digital differentiator, and determine the FIR coefficients of the 1-P order digital differentiator filter respectively;

[0065] The fourth step is to perform polyphase decompositio...

Embodiment 2

[0079] In this embodiment, on the basis of embodiment 1, a specific experiment has been carried out, and the experimental environment is as follows:

[0080] The test signal used is a multi-sine signal generated by the UTG9005D digital signal generator of Unilever, with a frequency of f 1 =0.35f s , f 2 =0.275f s , f 3 =0.2f s , where the sampling frequency f s = 320MHz. The time-interleaving analog-to-digital converter is composed of 4 pieces of AD9481 of ADI Company, and the sampling rate of each piece is 250Msps when working. The whole time interleaved ADC runs at 1Gsps.

[0081] Such as figure 1 as shown, figure 1 It is a structural schematic diagram of a time-interleaved analog-to-digital converter. The input signal is input by M channels, and each channel uses the same sampling rate but different sampling moments (the difference between adjacent channels is T s Time) to sample the high-speed input signal, and finally combine the output signal, so as to realize ...

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Abstract

The invention provides a linear distortion correction method of a time interleaved analog-digital converter based on multiphase decomposition having low computational complexity. The method comprises the following steps: expressing spectral characteristics of a channel by a transfer function, then mapping the spectral characteristics into frequency response of a high order differentiator, carrying out multiphase decomposition processing on the constructed differentiators separately, providing an equivalent TIADC analysis module based on a multiphase structure, and extracting crosstalk and errors from an out[ut signal according to the model to complete multichannel correction. Experiments prove that the method has low requirements on the working speed of a correction filter, is simple and feasible, good in compensation effect and has universality to the correction of general frequency distortion errors.

Description

technical field [0001] The present invention relates to the technical field of signal sampling and processing, and more specifically, to a method for correcting linear distortion of a time-interleaved analog-to-digital converter based on polyphase decomposition. Background technique [0002] With the continuous development of integrated circuit technology and the promotion of digital technology, the requirements for the sampling rate and sampling accuracy of the analog-to-digital conversion device ADC are getting higher and higher. Not only the data acquisition system is required to have a high sampling rate, but also a high sampling rate precision. In actual application, there is a high dependence on the real-time sampling rate and sampling accuracy. However, the maximum sampling rate of ADC is limited by its resolution. There is a contradiction between resolution and sampling rate. High sampling rate requires shorter conversion time, while high resolution requires longer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/08H03M1/10
CPCH03M1/08H03M1/1009
Inventor 谭洪舟蔡彬李宇王江妹农革
Owner SYSU CMU SHUNDE INT JOINT RES INST
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