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Bandwidth mismatching optimization method for multi-channel time-interleaved analog-to-digital converter

An analog-to-digital converter and time interleaving technology, applied in the field of microelectronics, can solve problems such as bandwidth mismatch and affecting the dynamic performance of analog-to-digital converters, and achieve the effect of dynamic linear performance optimization

Active Publication Date: 2017-04-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Theoretically, the more channels the time-interleaved A / D converter has, the faster it can work; however, there are non-ideal factors such as bandwidth mismatch among sub-A / D converters of each channel, which seriously affects the dynamics of the entire A / D converter. performance

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Embodiment Construction

[0035] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing and embodiment:

[0036] In order to better illustrate and understand the idea of ​​the present invention, this embodiment takes 16-channel TIADC as an example, such as Figure 4 As shown, the transmission bandwidth between the signal and each sub-channel is different. This set of bandwidth information indicates the mismatch of the signal on the transmission path. The bandwidth information vector of each channel signal transmission is as follows:

[0037] W 16 =(w 0 ,w 1 ,w 2 ,...w 14 ,w 15 )

[0038] The order of the above bandwidth values ​​in the vector is the order of the system sampling clock (working timing), such as image 3 The clock sequence represented by the solid line in the center shows that it is given to each channel in sequence. This situation will cause the stray energy at certain frequency points to accumulate and deteriorate the d...

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Abstract

The invention, which belongs to the technical field of microelectronics, provides a bandwidth mismatching optimization method for a multi-channel time-interleaved analog-to-digital converter. The method comprises: bandwidth parameters of signal transmission paths of all sub channels are extracted, calculation is carried out to obtain bandwidth mismatching values of all channels relative to a reference channel, a vector is formed and is used as an initial bandwidth mismatching vector, the vector is introduced into an objective function, and calculation is carried out to obtain an objective function initial solution; and elements in the bandwidth mismatching vector change randomly to generate a new bandwidth mismatching vector, the new bandwidth mismatching vector is introduced into an objective function, calculation is carried out to obtain a solution of the objective function, a minimum solution of the objective function is updated by using an energy state minimization algorithm until the updating frequency of the minimum solution of the objective function in the energy state minimization algorithm reaches a preset number of times, and then the minimum solution of the objective function is outputted. Therefore, optimization of a dynamic linear performance SFDR of the multi-channel time-interleaved analog-to-digital converter can be realized; no influence on other performances of the device is caused; and no circuit cost increase.

Description

technical field [0001] The invention belongs to the field of microelectronic technology, relates to a multi-channel time-interleaved analog-to-digital converter in the microelectronic technology, in particular to a bandwidth mismatch optimization method of the multi-channel time-interleaved analog-to-digital converter. Background technique [0002] With the reduction of process feature size, the working speed of digital integrated circuits has been greatly improved, making the analog-to-digital converters with ordinary structures unable to meet the speed requirements of digital signal processing, which also makes more and more researchers pay attention to how to improve the analog-to-digital converter. The working speed of the converter. [0003] In order to improve the working speed of traditional analog-to-digital converters, a structure in which multiple analog-to-digital converters work in parallel is proposed, that is, Time-interleaved ADC (TIADC), the analog-to-digital...

Claims

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Application Information

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IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 李靖邓健罗建宁宁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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