I/Q Methods Applied to Phase Detection of RF Signals

LIU Yi-Lei; WANG Guang-Wei; WANG Fang

Chinese Physics C> 2006, Vol. 30> Issue(8) : 780-783

I/Q Methods Applied to Phase Detection of RF Signals

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

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Abstract：
Phase detection performs a crucial role in the phase control loop of RF signals in accelerators. This paper presents two methods that apply I/Q technique to phase detection of RF signals. The content includes the study of arithmetic and the setup of systems. The methods are as follows: 1. adopting I/Q demodulator, AD card and the technique of digital processing to detect the phase; 2. direct digital I/Q method. In the former, feasible calibration arithmetic against the inherent error of I/Q demodulators is suggested. In the latter, I and Q signals are generated by modulating the LO signal with a step of(2π/N). The phase detection error is below 0.5° by using either of them.

References

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LIU Yi-Lei, WANG Guang-Wei and WANG Fang. I/Q Methods Applied to Phase Detection of RF Signals[J]. Chinese Physics C, 2006, 30(8): 780-783.

LIU Yi-Lei, WANG Guang-Wei and WANG Fang. I/Q Methods Applied to Phase Detection of RF Signals[J]. Chinese Physics C, 2006, 30(8): 780-783. shu

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Received: 2005-11-02
Revised: 2005-11-28

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沈阳化工大学材料科学与工程学院沈阳 110142

I/Q Methods Applied to Phase Detection of RF Signals

Corresponding author: LIU Yi-Lei,

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Received Date: 2005-11-02
Accepted Date: 2005-11-28
Available Online: 2006-08-05

Abstract: Phase detection performs a crucial role in the phase control loop of RF signals in accelerators. This paper presents two methods that apply I/Q technique to phase detection of RF signals. The content includes the study of arithmetic and the setup of systems. The methods are as follows: 1. adopting I/Q demodulator, AD card and the technique of digital processing to detect the phase; 2. direct digital I/Q method. In the former, feasible calibration arithmetic against the inherent error of I/Q demodulators is suggested. In the latter, I and Q signals are generated by modulating the LO signal with a step of(2π/N). The phase detection error is below 0.5° by using either of them.