一种有效的数字带宽交错采样系统标定方法

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
Yubo Ma, Jie Wu, Xiaochang Jiang, Boyi Xu, Shengyu Qi
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引用次数: 0

摘要

数字带宽交织(DBI)是一种能够同时提高系统采样率和带宽的技术。虽然与时间交错采样系统相比,DBI可以减少时钟抖动对系统动态性能的影响,但由于模拟滤波器和模拟混频器的非线性导致的交叉带相位失调,实现与时间交错模数转换器(TIADC)相当的动态性能仍然具有挑战性。为了解决这些问题,本文提出了一种利用PRBS信号校准DBI采样系统的方法。该方法将伪随机二值序列(pseudo-random binary sequence, PRBS)信号作为背景信号注入系统输入,计算输出采样序列与PRBS序列的相关性,得到各采样通道的响应。与传统的单音信号或脉冲信号相比,该方法提供了更有效的背景标定方法。为了验证该方法的有效性,本文设计了一个结合DBI和TIADC的混合并行采样系统,采样率为20 GSPS,带宽为8 GHz,以评估该校准方法的有效性。在校准前后采样系统的性能测试中,该校准方法使系统的信噪比和失真比(SINAD)提高了13 dB,无杂散动态范围(SFDR)提高了27 dB,相位响应平坦度优于0.3弧度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An efficient calibration method for digital bandwidth interleaving sampling system
Abstract Digital bandwidth interleaving (DBI) is a technique that can simultaneously increase system sampling rate and bandwidth. While DBI can reduce the impact of clock jitter on the dynamic performance of the system compared to time-interleaved sampling systems, achieving dynamic performance comparable to time-interleaved analog-to-digital converters (TIADC) remains challenging due to phase misalignment in crossover bands caused by analog filters and nonlinearity in analog mixers. To address these issues, this paper proposes a method to calibrate DBI sampling systems using PRBS signals. This method involves injecting pseudo-random binary sequence (PRBS) signal into the system input as a background signal and calculating the correlation between the output sampling sequence and the PRBS sequence to obtain the response of each sampling channel. Compared with traditional single tone signal or pulse signal, this method offers a more efficient background calibration method. To verify the effectiveness of this method, this paper designed a hybrid parallel sampling system combining DBI and TIADC with a 20 GSPS sampling rate and 8 GHz bandwidth to evaluate the effectiveness of the calibration method. In the performance test of the sampling system before and after calibration, this calibration method improved the system's Signal-to-Noise and Distortion Ratio (SINAD) by up to 13 dB, Spurious Free Dynamic Range (SFDR) by up to 27 dB, and phase response flatness better than 0.3 radians.
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来源期刊
Journal of Instrumentation
Journal of Instrumentation 工程技术-仪器仪表
CiteScore
2.40
自引率
15.40%
发文量
827
审稿时长
7.5 months
期刊介绍: Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include. -Accelerators: concepts, modelling, simulations and sources- Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons- Detector physics: concepts, processes, methods, modelling and simulations- Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics- Instrumentation and methods for plasma research- Methods and apparatus for astronomy and astrophysics- Detectors, methods and apparatus for biomedical applications, life sciences and material research- Instrumentation and techniques for medical imaging, diagnostics and therapy- Instrumentation and techniques for dosimetry, monitoring and radiation damage- Detectors, instrumentation and methods for non-destructive tests (NDT)- Detector readout concepts, electronics and data acquisition methods- Algorithms, software and data reduction methods- Materials and associated technologies, etc.- Engineering and technical issues. JINST also includes a section dedicated to technical reports and instrumentation theses.
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