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

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

doi:10.1088/1674-1137/39/1/017002

Chinese Physics C> 2015, Vol. 39> Issue(1) : 017002 DOI: 10.1088/1674-1137/39/1/017002

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

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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.

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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 and MA Qiang. High accuracy amplitude and phase measurements based on a double heterodyne architecture[J]. Chinese Physics C, 2015, 39(1): 017002. doi: 10.1088/1674-1137/39/1/017002

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Received: 2014-01-20
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: ZHAO Dan-Yang,

Received Date: 2014-01-20

Accepted Date: 1900-01-01

Available Online: 2015-01-05

Abstract: 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.

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

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通讯作者: 陈斌, bchen63@163.com

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

Corresponding author: ZHAO Dan-Yang,

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