摘要
非线性矢量网络分析仪(NVNA)是一种针对射频微波器件非线性行为表征的测量装置,通过引入一个相位参考信号实现复杂被测对象的相位谱测量,目前主要用于功率放大器(PA)的表征和建模研究。提出了一种基于双相位参考结构的NVNA改进方案,并尝试用于混频器的非线性行为表征研究。该方案采用一个"步进式"的多频正弦信号作为"主"相位参考,以实现高频谱分辨率的多频段测量,同时引入第2个低频谱分辨率的"辅助"相位参考提供各测量频段的相位同步。该方案能够显著提高测量装置的信噪比,具备对多频段、"调制+谐波"复杂被测对象的测量表征能力。实验表明,该方案可以提供小于±0.2°相位谱测量稳定度,能够进行混频器在复杂调制状态下的相位和谐波失真特性分析。
Nonlinear Vector Network Analyzer（ NVNA） is a measurement setup for characterizing the nonlinear behavior of RF/Microwave devices. It uses a phase reference to achieve the phase spectrum measurement of a complex test target,and is mainly used for the power amplifier characterization and modeling at present. This paper presents an improved two-phase-reference NVNA setup,and investigates its performance for mixer characterization with nonlinear behaviors. This novel NVNA setup uses a ＂stepped＂multisine as the primary phase reference,to achieve multi-band measurement on a dense spectral grid,and uses a second＂auxiliary＂phase reference on a coarse grid to ensure the synchronization between multi-band phase measurements. As a result,the signal-to-noise ratio of the test bench can be largely improved,and a complex test target with multi-band and ＂modulated multi-harmonic ＂ components can be characterized. According to the experimental results,the proposed method can guarantee a phase measurement stability of less than± 0. 2° fluctuation,and achieve the phase and harmonic distortion analysis of a mixer under complex modulation.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2017年第10期2477-2483,共7页
Chinese Journal of Scientific Instrument
基金
国家重点研发计划(2017YFF0206202)
国家自然科学基金(61701469)项目资助
关键词
非线性矢量网络分析仪
相位参考
相位谱测量
混频器
非线性
nonlinear vector network analyzer （NVNA）
phase reference
phase spectrum measurement
mixer
nonlinearity
