Estimation and Correction of Gain Mismatch and Timing Error in Time-Interleaved ADCs Based on DFT

Tian, Shulin; Wang, Zhigang

doi:10.2478/mms-2014-0045

Cited by 11 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A brief comparison indicating the hardware complexity of the proposed FFT-based mismatch calibration algorithm and the prior FFT-based methods in [14], [21], and [22] are presented in Table I. We assume the length of sample data for the calibration is N. Note that, for all these FFT-based techniques, the estimation accuracy increases with the number of N; however, a larger N will lead to greater computational complexity.…”

Section: B Digital Calibration Experimental Resultsmentioning

confidence: 99%

“…It is clear that choosing the mid-range as the time reference has a much better performance than using one sub-ADC as the time reference for the Taylor-based time-skew correction. Most previous FFT-based estimation methods [14], [22], [23] must use one sub-ADC as the time reference, which may degrade the performance of the time-skew correction.…”

Section: Monte Carlo Simulation For Time-skew Referencementioning

confidence: 99%

“…The presence of gain and time-skew mismatch affects each other's estimation; thus, it is essential to jointly estimate the gain and time-skew mismatches. The calibration algorithm in [23] and [22] have to use extra steps to estimate the offset mismatch and must use one specific sub-ADC as the reference. The various options of time reference are introduced in [15], [16], [17], and [18], e.g., using zero, sub-ADC, the mid-range point, and extra reference ADC as a time reference.…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Foreground Mismatch and Memory Harmonic Distortion Calibration Algorithm for TIADC

Shen

Blaq

John

et al. 2023

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

This paper proposes a foreground digital calibration algorithm that estimates and corrects the offset, gain, and time-skew mismatches for time-interleaved analog-to-digital converters (TIADCs) furthermore our algorithm is designed to correct for harmonic distortion introduced by the presence of a nonlinear front-end. We propose a novel simplified non-linear model in place of the more complex conventional Volterra series based structure. The mismatch estimation technique based on the Fast Fourier Transform (FFT) is proposed to estimate the various time-interleaving mismatches simultaneously. A Taylorbased technique is applied to compensate for these mismatches. We also consider the choice of an appropriate time reference for the time-skew correction algorithm by theoretical analysis. The nonlinear distortion correction technique is based on estimating and inverting an assumed 3 rd order nonlinearity with a fractional delay. To do this, we design a customized filter in an offline process. Our algorithms are designed to operate in any Nyquist zone. The proposed techniques are verified by a Xilinx Zynq UltraScale+ RFSoC ZCU111 evaluation kit containing a 12-bit, 4.096 GHz TI-ADC with 8 sub-ADCs operating in the 2 nd Nyquist zone. Accordingly, we observed an improvement in SFDR of 14 dB for mismatch calibration alone and up to another 12 dB with nonlinear correction enabled.

show abstract

Section: B Digital Calibration Experimental Resultsmentioning

confidence: 99%

Section: Monte Carlo Simulation For Time-skew Referencementioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

A Foreground Mismatch and Memory Harmonic Distortion Calibration Algorithm for TIADC

Shen

Blaq

John

et al. 2023

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

show abstract

Blind Calibration Method for Two-Channel Time-Interleaved Analog-to-Digital Converters Based on FFT

Bai

et al. 2018

J Electron Test

View full text Add to dashboard Cite

An adaptive calibration technique of timing skew mismatch in time-interleaved analog-to-digital converters

Gao

Zeng

et al. 2019

Review of Scientific Instruments

View full text Add to dashboard Cite

Because of the exponential increase of sampling rate, time-interleaved analog-to-digital converter (TIADC) has a fast growth in the high-speed applications. However, the channel mismatch error is a serious challenge for the performance of TIADC. In this article, we address the timing skew mismatch error and propose a novel adaptive calibration method. The principle and operating process of the calibration algorithm are explained. To validate the proposed technique, we designed a four-channel TIADC-based digital oscilloscope with a sampling rate of 10 GS/s. Based on this instrumentation platform, (i) calibration algorithm was implemented by hardware; and (ii) a test platform consisting of advanced instruments and tools was setup to testify the effect and robustness of proposed algorithm. Moreover, the technical details of instrumentation are described for the first time. The experimental results show that the calibration algorithm significantly suppresses the distortions due to timing skew mismatch error. The TIADC-based instrumentation achieves spurious-free dynamic range of 52.48 dB and effective number of bits of 5.83 bit, respectively. Besides, the complexity of the proposed algorithm is compared and discussed.

show abstract

Estimation and Correction of Gain Mismatch and Timing Error in Time-Interleaved ADCs Based on DFT

Cited by 11 publications

References 20 publications

A Foreground Mismatch and Memory Harmonic Distortion Calibration Algorithm for TIADC

A Foreground Mismatch and Memory Harmonic Distortion Calibration Algorithm for TIADC

Blind Calibration Method for Two-Channel Time-Interleaved Analog-to-Digital Converters Based on FFT

An adaptive calibration technique of timing skew mismatch in time-interleaved analog-to-digital converters

Contact Info

Product

Resources

About