一种自动天线阻抗匹配CMOS电路的设计  

Design of an Automatic Antenna Impedance Matching CMOS Circuit

作　　者：张力 徐兴 ZHANG Li;XU Xing(School of Physics&Electronics,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学物理与微电子科学学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2022年第12期176-182,共7页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金青年基金资助项目(2019JJ50073);中央高校基本科研业务费专项资金资助项目(531118010110)。

摘　　要：为了解决小型化天线阻抗匹配时由于电感的精度不足导致阻抗匹配效果变差的问题,提出一种自动天线阻抗匹配的CMOS电路.首先,提出了一种新型阻抗匹配方法,该方法通过在天线的输入端与末端添加电容的方式来实现阻抗匹配.然后,通过将匹配的电容进行集成,提出一种片上自动阻抗匹配电路,通过功率检测电路和峰值检测电路来判断天线的输入功率的大小,通过电容扫描电路和程控电容来改变天线的输入阻抗.通过该电路,天线可以自动调节输入阻抗来匹配源端的输出阻抗,以获得最大的输入功率.该电路省去了使用网络分析仪调节阻抗匹配的步骤,从而可以降低测试环境的变化对阻抗匹配的影响,降低了射频功率放大器输出阻抗的设计要求,可以通过设计匹配电容的精度来改变阻抗匹配的精度.In order to solve the problem that the performance of impedance matching deteriorates due to the in⁃sufficient precision of the inductor in miniaturized antenna impedance matching,a complementary metal-oxidesemiconductor(CMOS)circuit for automatic antenna impedance matching is proposed.Firstly,a new impedancematching method is proposed,which realizes impedance matching by adding capacitors to the input and end of the an⁃tenna.Then by integrating the matched capacitors,an automatic impedance matching circuit is proposed.The main principle is to judge the input power of the antenna through the power detection circuit and the peak detection circuit and to change the input impedance of the antenna through the capacitor scanning circuit and the capacitor controlled by the program.The innovation of the circuit is also reflected in removing the step of adjusting impedance matching using a network analyzer,so as to reduce the influence of test environment change on impedance matching.The de⁃sign requirements of the output impedance of the RF power amplifier are reduced.The precision of impedance match⁃ing can be changed by designing the precision of matching capacitors.

关 键 词：微带天线 阻抗匹配(电气) 互补金属氧化物半导体集成电路 

分 类 号：TN492[电子电信—微电子学与固体电子学]