TIADC time error mismatch self-adaption blind correction method based on differentiator and average time error

A technology of time error and correction method, applied in the direction of analog/digital conversion calibration/test, electrical components, code conversion, etc. The effect of realization difficulty and power consumption reduction

Active Publication Date: 2016-07-27
BEIJING UNIV OF TECH
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Problems solved by technology

The more the number of channels, the more complex the correction structure and the greater the power consumption, the more difficult it is to realize

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  • TIADC time error mismatch self-adaption blind correction method based on differentiator and average time error
  • TIADC time error mismatch self-adaption blind correction method based on differentiator and average time error
  • TIADC time error mismatch self-adaption blind correction method based on differentiator and average time error

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 Shown is a schematic structural diagram of a time-alternating analog-to-digital converter (TIADC) system, including M channels. The entire TIADC system consists of M parallel working sampling time intervals of MT s Composed of sub-ADCs, the total operating frequency of TIADC is f s =1 / T s , where T s is the total sampling period of TIADC. r 0 ,r 1 ,...,r k ,...,r M-1 Represent the relative time errors of sub-ADC-0, ADC-1,..., ADC-k,..., ADC-(M-1) respectively. Each sub-ADC works in parallel, the input analog signal x c (t) After being sampled in parallel by the sub-ADC of the M channel, it is restored to an uncorrected non-ideal non-uniform digital sampling value y[n] of the TIADC with time error mismatch through the multiplexer MUX. Then y[n] is corrected using the correction method in the pre...

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Abstract

A TIADC(Time Interleaved Analog-to-digital Converter) time error mismatch self-adaption blind correction method based on differentiator and average time error belongs to the field of analog digital conversion. According to the invention, slope approximation and the average value of time errors of all slave ADCs of the TIADC are utilized for deducing a system unknown parameter to be estimated. The TIADC system is adopted for sampling output values practically, the differentiator and a high-pass filter are utilized, a certain degree of oversampling is required and a minimum mean squared error algorithm is utilized for realizing the self-adaption blind correction of the time error mismatch of the TIADC system. The to-be-estimated parameter of the correction system is a difference value between the relative time error of each slave ADC and the average value of the relative time error of all the slave ADCs. The parameter is used for error reconstruction and system compensation. By adopting the method provided by the invention, hardware complexity, hardware implementation difficulty and system power consumption are reduced effectively. The method can be applied to multiple channels. The more the channel number is, the more obvious the advantage of the method becomes.

Description

technical field [0001] The invention relates to an adaptive blind correction method for time error mismatch of a TIADC (Time-Interleaved Analog-to-digital Converter, time-alternating analog-to-digital converter) based on a differentiator and an average time error, belonging to high-speed and high-precision analog-to-digital conversion technology field. Background technique [0002] The TIADC system composed of multiple relatively low-speed and high-precision single ADCs with a parallel time-alternating sampling structure has become the development direction of high-speed, high-precision ADCs. However, in practical applications, the error mismatch (time error mismatch, gain error mismatch and offset error mismatch) between sub-ADCs in the TIADC system caused by factors such as manufacturing process will seriously affect the overall TIADC performance. Among them, the gain error mismatch and offset error mismatch are relatively easy to deal with, while the time error mismatch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 刘素娟马海啸
Owner BEIJING UNIV OF TECH
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