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Time-interleaved sampling adc all-digital blind compensation method for ultra-wideband signals

An ultra-wideband signal and time interleaving technology, which is applied in the direction of analog/digital conversion calibration/test, analog/digital conversion, code conversion, etc., can solve the problems of information loss, error estimation accuracy and convergence speed decline, and difficulty in adapting to ultra-wideband signal errors Compensation and other issues to achieve the effect of low complexity, strong universality, and saving storage space

Active Publication Date: 2020-07-10
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional all-digital domain compensation technology can be further divided into two categories: the first is full-digital domain non-blind compensation, which requires known information of the input signal to estimate the mismatch error parameters or set the filter coefficients. It is necessary to recalculate the error parameters when changing, especially when the sampling rate is as high as tens of GS / s, the process of adjusting the parameters will cause a lot of information loss, so this method is difficult to meet the scenario of dynamic parameter changes; the second category is the full Blind compensation in the digital domain, this technology generates a new signal by performing a series of transformations on the sampled output, and then correlates with the original actual output signal to estimate the mismatch error parameter. The traditional full digital domain blind compensation method increases the input signal bandwidth. The accuracy and convergence speed of error estimation will be significantly reduced, and it is difficult to adapt to the error compensation of ultra-wideband signals in practical applications

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Embodiment 1

[0047] As a preferred embodiment of the present invention, with reference to the attached figure 1 and 3 , this example discloses:

[0048]The time-interleaved sampling ADC full-digital blind compensation method for ultra-wideband signals translates and folds the sampled output signals to produce a set of orthogonal basis functions used to characterize spurious signals, uses the least squares algorithm to estimate the parameters of the error signal, and Carry out progressive iterations to eliminate mismatch errors, and finally realize error compensation for ultra-wideband signals. Compared with the traditional analog-digital mixed compensation method, the method of the present invention directly processes the sampling signal in the digital domain, without the need to design redundant analog circuit adjustment modules, and can be adapted to TI-ADC systems with different numbers of channels. Compared with the traditional all-digital domain non-blind compensation method, this t...

Embodiment 2

[0050] As another preferred embodiment of the present invention, with reference to the attached Figure 1-4 , this example discloses:

[0051] The time-interleaved sampling ADC full-digital blind compensation method for ultra-wideband signals first performs frequency translation and folding on the sampled output signal to generate a set of orthogonal basis functions used to characterize spurious signals, and then uses least squares (LeastSquare, LS) The algorithm estimates the error parameters, and performs successive iterations to eliminate the mismatch error, and finally realizes the error compensation of the UWB signal.

[0052] The error model of TI-ADC is as figure 1 As shown, the system contains M sub-channels, and each channel has a different DC bias, gain and sampling clock. The frequency response of the mth channel (without DC bias) can be expressed as:

[0053]

[0054] Among them, △ gm and △ tm Represents the gain error and clock skew error of the mth channe...

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Abstract

The invention discloses a time-interleaved ADC all-digital blind compensation method of an ultra wide band signal, and relates to the technical fields of mixed analog-to-digital circuits and signal processing. According to the invention, the method includes the following steps: shifting and folding a sample output signal, generating a group of orthogonal basis functions which are used to represent spurious signals, using the least squares algorithm to estimate the parameter of error signals, and performing progressive iteration, eliminating mismatching errors, and eventually realizing error compensation of ultra wide band signals. According to the invention, the compensation process is free from effects of simulation circuit or error parameters, only needs a FIR filter, saves lots of filter designing jobs, and reduces the complexity of digital processing.

Description

technical field [0001] The invention relates to the field of digital-analog hybrid circuits and signal processing, and more specifically relates to a time-interleaved sampling ADC all-digital blind compensation method for ultra-wideband signals. Background technique [0002] With the rapid development of wireless communication, instrument measurement and other electronic systems, people's demand for high-speed sampling is becoming more and more urgent. High-speed Analog-to-Digital Converter (Analog-to-Digital Converter, ADC) as the core device has attracted a large number of scholars' research. Under the existing technological level, it is difficult for a single-chip ADC to guarantee high sampling rate (several GS / s to tens of GS / s) and high-precision effective bits at the same time, and its power consumption will increase sharply with the increase of sampling rate . Therefore, people generally adopt a time-interleaved ADC (Time-Interleaved ADC, TI-ADC) system architecture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 秋勇涛周劼刘友江
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS