强激光与粒子束, 2005, 17 (12): 1879, 网络出版: 2006-04-28
基于I/Q解调原理的数字PAD研制
Design of a digital PAD based on I/Q demodulation principle
I/Q解调器 相位和幅度探测器 相控系统 直线加速器 Hilbert变换 I/Q demodulator PAD（phase-amplitude detector） Phasing system Linac Hilbert transform
摘要
I/Q解调器可以同时测量微波信号的相位和幅度.为了消除传统I/Q解调器的不平衡误差,根据I/Q解调原理,应用数字滤波器及Hilbert变换等数字信号处理方法实现了对微波信号的正交解调,可以精确测量任意包络形状微波信号的相位和幅度.测试表明,数字相位和幅度探测器的精度可达±0.5°,重复性误差小于0.2°,温度系数约为-0.1°/℃,相位测量的动态范围为-18～5 dBm,幅度测量的动态范围为-20～0dBm,其各项指标都达到了BEPCⅡ直线加速器相控系统的要求.
Abstract
Conventional analog I/Q demodulator suffers from phase and amplitude imbalance and DC offset,which cause big error into the measurement.A digital PAD is designed.Based on I/Q demodulation principle,using digital algorithms,such as digital filter and Hilbert transform,the conventional measurement error can basically be removed.Measuremental results show that the digital PAD has a maximum phase error of ±0.5° and a resolution of 0.2°.Its temperature coefficient is-0.1°/℃.Its dynamic ranges for phase-measurement and amplitude-measurement are-18~5 dBm and-20~0 dBm,respectively.The digital PAD can meet the need of the BEPCⅡ phasing system.
耿哲峤, 崔艳艳, 侯汨, 裴国玺. 基于I/Q解调原理的数字PAD研制[J]. 强激光与粒子束, 2005, 17(12): 1879. GENG Zhe-qiao, CUI Yan-yan, HOU Mi, PEI Guo-xi. Design of a digital PAD based on I/Q demodulation principle[J]. High Power Laser and Particle Beams, 2005, 17(12): 1879.
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