【作者】 韩宇阳； 张凡； 陈帅； 徐金平；

【Author】 Yuyang Han;Fan Zhang;Shuai Chen;Jinping Xu;Southeast University;

【机构】 东南大学；

【摘要】 矢量合成移相器通过调节I路和Q路信号的幅度来控制合成信号相位,它是一种的实现超宽带信号相位精确控制的有效方法。为了实现相移步进在1°以内的超高精度相位控制,除了需要对I路和Q路信号的幅度实施精确控制以外,还必须对这两个支路各自的附加相移有深入的了解,并准确评估其对合成信号相移量所产生的附加影响。有鉴于此,本文对一种基于DAC的宽带模拟衰减器在0.1-18GHz频段内不同衰减量情况下的附加相移特性进行了实验研究。为了提高现有的基于TGL4203的模拟衰减器的衰减量准确度,首先将DAC的控制电压最小步进从1mV提高到0.1mV,重新测定控制电压并进行插值处理,有效提高了衰减量的控制精度。在此基础上,在31dB动态衰减范围内,对不同频率的信号的附加相移进行了大量的摸底测试。实测结果表明,在0.1-5GHz频段内,不同衰减量条件下的附加相移变化率小于1.5°/dB;在频段为5-18GHz范围内,不同衰减量条件下的附加相移变化率小于6°/dB。本文实验结果为有关宽带高精度矢量移相器的分析设计及实验校正提供了有价值的参考依据。更多还原

【Abstract】 The vector synthesis phase shifter controls the phase of the synthesized signal by adjusting the amplitude of the I and Q signals.It is an effective method to achieve accurate phase control of ultra-wideband signals.In order to achieve ultra-high precision phase control with phase shift step within 1 °,in addition to the need to accurately control the amplitude of I-channel and Q-channel signals,it is also necessary to have an in-depth understanding of the additional phase shifts of these two branches and accurately evaluate their additional effects on the phase shift of the synthetic signal.In view of this,the additional phase shift characteristics of a DAC-based wideband analog attenuator with different attenuations in the 0.1-18GHz band are experimentally studied.In order to improve the accuracy of the attenuation of the existing analog attenuator based on TGL4203,the minimum step of the control voltage of the DAC is reduced from 1mV to 0.1mV,and the control voltage is re-measured and interpolated,which effectively improves the control accuracy of the attenuation.Based on this,a large number of tests are carried out to acquire the data of additional phase shift of signals with different frequencies in the dynamic attenuation range of 31dB.The measured results show that the additional phase shift change rate is less than1.5 °/dB under different attenuation conditions in the 0.1-5GHz band.In the frequency range of 5-18 GHz,the additional phase shift change rate under different attenuation conditions is less than6 °/dB.The experimental results in this paper provide valuable reference for the analysis,design and experimental correction of broadband high-precision vector synthesis phase shifter.更多还原