A Nonlinear Mismatch Compensation Method for Four-channel TIADC

A mismatch compensation and non-linear technology, applied in the field of non-linear mismatch compensation of four-channel TIADC, can solve problems such as time error and limited compensation system performance, and achieve the effects of fast convergence speed, performance improvement, and large input dynamic range

Active Publication Date: 2020-10-16
SUN YAT SEN UNIV +1
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Problems solved by technology

[0005] At present, most digital back-end compensation methods must target specific error types such as gain error and time error, which limits the performance improvement of the compensation system
Even if the effect of the linear filter error is transferred to the frequency domain response mismatch error through the channel transfer function, its processing range still limits the error to a linear range

Method used

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  • A Nonlinear Mismatch Compensation Method for Four-channel TIADC
  • A Nonlinear Mismatch Compensation Method for Four-channel TIADC
  • A Nonlinear Mismatch Compensation Method for Four-channel TIADC

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Experimental program
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Embodiment 1

[0034] Such as Figure 4 As shown, the method provided by the invention specifically includes the following steps:

[0035] S1. Set the input signal x(t) to satisfy the Nyquist sampling theorem, and use slight oversampling to obtain the output y[n] of the 4-TIADCs system;

[0036] S2. Design a high-pass filter f[n] so that the cut-off frequency of the high-pass filter f[n] is higher than the cut-off frequency of the sampling signal, and then use the high-pass filter f[n] to output y[n of the 4-TIADCs system ] to perform filtering processing to obtain the expected error signal e that only contains nonlinear mismatch error information d [n];

[0037] S3. Using the Taylor series to represent the nonlinear mismatch characteristics of the 4-TIADCs system channel, then the nonlinear transfer characteristic function of the mth channel of the 4-TIADCs system where L represents the order of the nonlinear transfer characteristic function, Represents the coefficient of the lth orde...

Embodiment 2

[0052] On the basis of embodiment 1, this embodiment has carried out concrete experiment:

[0053] In this experiment, Gaussian white noise with a mean of zero and a variance of 1 was used as the input of 4-TIADCs. Such as figure 1 Shown is a schematic diagram of the structure of the time-interleaved analog-to-digital converter. The input signal is input by M channels, and each channel samples the high-speed input signal at the same sampling rate but at different sampling times (the time difference between adjacent channels is T3), and finally merges The output signal is output to realize the analog-to-digital conversion of high-speed sampling. figure 2 It is a schematic diagram of a four-channel TIADC model with nonlinear mismatch characteristics. This model uses L-order Taylor series to characterize the nonlinear transmission characteristics of each channel. In this experiment, a third-order nonlinear model is used to model the system, that is, L=3 , the parameters are se...

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Abstract

The invention provides a nonlinear mismatch compensation method for 4-TIADCs. According to the method, the processing of a nonlinear mismatch error is expanded to a four-channel system, the possibility of realizing relatively fast precise sampling is provided, and a relatively high demand for the 4-TIADCs is satisfied. According to the method provided by the invention, nonlinear characteristics of each channel are expressed through adoption of Taylor series with appropriate orders; slight oversampling is carried out on an input signal, thereby obtaining mismatch information; real-time estimation is carried out on the nonlinear mismatch error based on a normalized least mean squares (NLMS) algorithm; the NLMS algorithm is simple in structure; compared with a basic LMS algorithm, the NLMS algorithm has the advantage of wider input dynamic range; further nonlinear mismatch parameters of the 4-TIADCs is obtained; and moreover, reconstruction and correction are carried out on the nonlinear mismatch error through utilization of the estimated nonlinear mismatch parameters, thereby obtaining compensation output. An experimental test shows that the method is practicable and fast in convergence rate. The performance of the 4-TIADCs is improved.

Description

technical field [0001] The present invention relates to the technical field of signal sampling and processing, and more specifically, relates to a nonlinear mismatch compensation method of a four-channel TIADC. 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 conversion time. According to the current IC design...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 谭洪舟李展强李宇蔡彬
Owner SUN YAT SEN UNIV
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