A 220 GHz Orthogonal Modulator Based on Subharmonic Mixers Using Anti-Paralleled Schottky Diodes

作     者：HE Yue LIU Ge LIU Juan LIN Changxing SU Wei HE Yue;LIU Ge;LIU Juan;LIN Changxing;SU Wei

作者机构：Microsystem and Terahertz Research Center China Academy of Engineering Physics Institute of Electronic Engineering China Academy of Engineering Physics 

出 版 物：《Chinese Journal of Electronics》 (电子学报(英文))

年 卷 期：2022年第31卷第3期

页      面：562-568页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 080902[工学-电路与系统] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by National Key R&D Program of China (2018Y FB1801504) the President Funding of China Academy of Engineering Physics (YZJJLX2018009) 

主　　题：subharmonic mixers amplitude imbalance I-Q mixer floating-point simulation power dividers millimetre wave mixers millimetre wave diodes waveguide couplers quadrature amplitude modulation Schottky diode mixers radio-over-fibre phase imbalance orthogonal modulator power divider 16 QAM modulation subharmonically pumped mixers quadrature branch in-phase branch antiparalleled Schottky diodes waveguide coupler 

摘      要：In this paper, A 220 GHz orthogonal modulator based on two symmetrical subharmonic mixers is designed, analyzed and measured, where the mixers are implemented basde on antiparallel Schottky *** orthogonal modulator consists of a 90° phase shifted220 GHz 3 d B coupler, two sub-harmonically pumped mixers and an in-phase 110 GHz 3 d B power divider. The IF output signals are in-phase(I) branch and quadrature(Q) branch operating from DC±3.5 GHz. In the back to back experimentaltests, it is shown that the conversion loss of the two 220 GHz I/Q mixers is less than 30 d B when the IF operating frequency is DC-3.5 GHz, IF input power is-10 d Bm and the LO power is around 6 m W. Based on floating-point simulation, the amplitude and phase imbalance of the I/Q mixer are less than 0.2 d B and 2 degree respectively. When the 220 GHz modulator and demodulator are set in a back to back configuration, a signal-to-noise ratio of 21 d B can be obtained using the 16 QAM modulation type.