Optimization of out-of-band impedance environment for linearity improvements of microwave power transistors
Optimization of out-of-band impedance environment for linearity improvements of microwave power transistors
复制标题
带外阻抗环境优化以提高微波功率晶体管的线性度
DOI：
10.1109/iceee2.2018.8391334
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
P. Tasker
中科院分区：
文献类型：
--
作者：
M. Chaudhary;Z. Memon;Z. Yusoff;J. Lees;J. Benedikt;P. Tasker
本文介绍了一种新的方法，允许特定的，宽带阻抗的DUT的负载牵引介绍。为了研究这种方法，J类功率放大器的衍生物被称为BJ仿真，它有效地位于J类和B类之间的史密斯圆图上的无功路由。该模式有助于探索基带线性化方法及其在使用连续模式架构时的适用性。采用带外阻抗优化技术允许呈现阻抗，并且以确定性和系统性的方式从完全真实的负载集合逐渐移动到完全虚构的负载集合。这进一步扩展了一个视图，以查看仿真模式在沿路径沿着的一组BJ轮廓点处的线性化程度。该方法使用在射频（RF）和中频（IF）处相位同步的多个调制信号源，以提供由单个本地振荡器控制的完整的多谐波宽带负载牵引能力，并且允许在DUT电流发生器平面处的完整阻抗控制。
This paper introduces a novel method that allows the presentation of specific, broadband impedances to a DUT by loadpull. To investigate this method, a derivative of class J power amplifier termed BJ is emulated, which effectively lies between class J and class B along the reactive routes on the Smith chart. The mode helps explore baseband linearization approach and its suitability when using continuous mode architectures. Adopting out-of-band impedance optimization technique allows to present impedances and move progressively from a completely real set of loads to completely imaginary set of loads in a deterministic and systematic way. This further extends a view to look at how well the emulated mode linearizes at a set of BJ contour points along the way. The method uses multiple modulated signal sources, phase synchronized at both radio frequency (RF) and intermediate frequency (IF) to provide a complete multi-harmonic broadband loadpull capability controlled by a single local oscillator and allows complete impedance control at the DUT current generator plane.