A digital background calibration method for time-interleaved ADCs based on frequency shifting technique

• Autorzy: Zheng Yanze , Mei Sitao , Sun Sicheng , Zhao Yijiu

Identyfikatory

DOI

10.24425/mms.2024.150282

• Języki publikacji: EN

Abstrakty

EN

The presence of channel mismatches in time-interleaved analog-to-digital converters (TIADCs) seriously degrades the performance of the acquisition system. This paper presents a digital background calibration method to address gain and time skew mismatches. The spurious signals caused by gain and time skew mismatches can be represented by the frequency-shifted signals produced by modulating the TIADC output. To create frequency-shifted signals, the Hadamard transform is adopted. The advantage of the proposed calibration method is that it does not require any filters or complex signal processing structures, thus considerably decreasing the complexity of the calibration circuit. We have employed a four-channel TIADC system to validate the effectiveness of the proposed calibration technique. Moreover, it is demonstrated in a commercial 12.5 GSPS four-channel TIADC system, that this method improves the spurious free dynamic range of the system by 25 dB.

Słowa kluczowe

EN

TIADC system; mismatch calibration; frequency shifting; Hadamard transform

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2024
• Tom: Vol. 31, nr 3
• Strony: 481--495
• Opis fizyczny: Bibliogr. 27 poz., rys., tab., wykr., wzory

Twórcy

autor

Zheng Yanze

• School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China

autor

Mei Sitao

• School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China

autor

Sun Sicheng

• School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China

autor

Zhao Yijiu

• School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China
• Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Chengdu, China

Bibliografia

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Uwagi

1. This work was supported in part by the Natural Science Foundation of the Sichuan Province under Grant 24NSFSC1520, and the Fundamental Research Funds for the Central Universities under Grant ZYGX2020ZB001.

2. Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).