Calibration method and experiment based on I/Q demodulation principle

ZHANG Zhigang; ZHAO Yubin; XU Kai; ZHENG Xiang; LI Zheng; ZHAO Shenjie; CHANG Qiang; HOU Hongtao; MA Zhenyu; LUO Chen; MAO Dongqing; SHI Jing; WANG Yan; LIU Jianfei

doi:10.11889/j.0253-3219.2015.hjs.38.030102

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Calibration method and experiment based on I/Q demodulation principle

更新时间：2021-03-03

- Calibration method and experiment based on I/Q demodulation principle
- NUCLEAR TECHNIQUES Vol. 38, Issue 3, Article number: 030102(2015)
- 作者机构：
  
  1. 中国科学院上海应用物理研究所嘉定园区,上海,201800
  2. 中国科学院大学,北京,100049
  3. 上海市低温超导高频腔技术重点实验室,上海,201800
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.030102
  CLC：
- Published：09 March 2015
- 稿件说明：
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ZHANG Zhigang, ZHAO Yubin, XU Kai, et al. Calibration method and experiment based on I/Q demodulation principle[J]. Nuclear techniques, 2015, 38(3): 030102
DOI：

ZHANG Zhigang, ZHAO Yubin, XU Kai, et al. Calibration method and experiment based on I/Q demodulation principle[J]. Nuclear techniques, 2015, 38(3): 030102 DOI： 10.11889/j.0253-3219.2015.hjs.38.030102.

摘要

同相/正交(In-phase/Quadrature

I/Q)解调技术广泛应用于射频信号相位控制系统。I/Q器件存在固有误差，如直流偏置、幅度不平衡、相位不平衡和电路长度不等。这些误差会导致输出的I/Q轨迹呈椭圆，相位为非线性，影响相位鉴别的精度。为减小误差带来的影响，提出一种基于I/Q解调技术的软件校准方法，并将此方法在自制基于贴片式芯片集成的I/Q解调印刷电路板上验证。测试表明，输出的I/Q信号经校准后相位误差≤±0.15°，幅度稳定度≤±1%，通道延时≤10 ns。此板卡设计和校准方法已在新升级的上海光源储存环高频束流丢失分析系统中的射频信号前端预处理中使用，各项指标均满足束流丢失分析系统中射频信号监测的要求。

Abstract

Background: In-phase/Quadrature (I/Q) demodulation technology is widely used in radio frequency signal phase control system. As the intrinsic errors in hardware

such as the imbalances of gain and phase in 90° hybrid and 0° hybrid

direct current (DC) offsets and phase errors from length difference of circuits

the output signal is an ellipse and the output phase is nonlinear to the input radio frequency (RF) signal. The detection of phase precision is influenced. Purpose: This study aims to reduce the effects of errors existed in the I/Q demodulators. Methods: A calibration method for I/Q demodulation technique is proposed and applied to research and development of I/Q integrate circuits

which is based on the surface mounted devices (SMD) chip. Results: Experimental tests showed that the phase error was less than ±0.15°

the amplitude stability was less than ±1%

and the channel delay was less than 10 ns. Conclusion: This calibration method

together with the designed circuit board for the RF signal front end preprocessing can reduce the effects of intrinsic errors efficiently. It has been being used in upgrading of beam trip diagnostic system in the storage ring of Shanghai Synchrotron Radiation Facility (SSRF). Abstract

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Related Author

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Related Institution

Shanghai Institute of Applied Physics, Chinese Academy of Sciences

China Institute of Atomic Energy

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Shanghai Institute of Metrological Technofogy

Shanghai Research Institute of Metrological Technology

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