High accuracy amplitude and phase measurements based on a double heterodyne architecture

In the digital low level RF （LLRF） system of a circular （particle） accelerator, the RF field signal is usually down converted to a fixed intermediate frequency （IF）. The ratio of IF and sampling frequency determines the processing required, and differs in various LLRF systems. It is generally desira...

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Bibliographic Details
Published inChinese physics C Vol. 39; no. 1; pp. 77 - 82
Main Author 赵丹阳 王光伟 潘卫民 孙毅 邱丰 张娟 米正辉 林海英 沙鹏 王群要 徐波 马强
Format Journal Article
LanguageEnglish
Published 2015
Subjects
Amplitudes
Architecture
Calibration
Design engineering
Intermediate frequency
Low level
Phase error
RF系统
Sampling
外差
幅度
相位测量
精度要求
结构
采样频率
高精确度
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/39/1/017002

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Summary:In the digital low level RF （LLRF） system of a circular （particle） accelerator, the RF field signal is usually down converted to a fixed intermediate frequency （IF）. The ratio of IF and sampling frequency determines the processing required, and differs in various LLRF systems. It is generally desirable to design a universally compatible architecture for different IFs with no change to the sampling frequency and algorithm. A new RF detection method based on a double heterodyne architecture for wide IF range has been developed, which achieves the high accuracy requirement of modern LLRF. In this paper, the relation of IF and phase error is systematically analyzed for the first time and verified by experiments. The effects of temperature drift for 16 h IF detection are inhibited by the amplitude and phase calibrations.
Bibliography:amplitude and phase measurements, double heterodyne architecture, wide IF, non-IQ sampling, LLRF
11-5641/O4
In the digital low level RF （LLRF） system of a circular （particle） accelerator, the RF field signal is usually down converted to a fixed intermediate frequency （IF）. The ratio of IF and sampling frequency determines the processing required, and differs in various LLRF systems. It is generally desirable to design a universally compatible architecture for different IFs with no change to the sampling frequency and algorithm. A new RF detection method based on a double heterodyne architecture for wide IF range has been developed, which achieves the high accuracy requirement of modern LLRF. In this paper, the relation of IF and phase error is systematically analyzed for the first time and verified by experiments. The effects of temperature drift for 16 h IF detection are inhibited by the amplitude and phase calibrations.
ZHAO Dan-Yang, WANG Guang-Wei, PAN Wei-Min, SUN Yi, QIU Feng,ZHANG Juan, MI Zheng-Hui, LIN Hai-Ying, SHA Peng, WANG Qun-Yao, XU Bo,MA Qiang（ 1 University of Chinese Academy of Science, Beijing 100049, China 2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 3 High Energy Accelerator Research Organization, KEK 1-10ho, Tsukuba, Ibaraki 305-0801, Japan）
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ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/39/1/017002