CAJ | 학술논문

射频功放在放大信号时的非线性使信号放大后产生失真,严重影响通信系统性能。主要针对射频功率放大器的三阶互调失真优化,提出了一种新型的模拟预失真器。融合了完全匹配的IMD3产生器、二次消基频概念,有效地消除了IMD3产生器的基频,降低了基频对三次谐波的干扰。电路设计引入了功率推动概念和双环结构,大大优化了L频段GaN功放的IMD3分量,提升功放线性度。使用ADS2009U1软件仿真实验证明,在950 MHz单音测试下,系统整体效率可达52.1%。在945 MHz和955 MHz双音测试下,IMD3增加了15 dB。该预失真器实现了在低效率损耗下对线性度的优化。
사빈공방재방대신호시적비선성사신호방대후산생실진,엄중영향통신계통성능。주요침대사빈공솔방대기적삼계호조실진우화,제출료일충신형적모의예실진기。융합료완전필배적IMD3산생기、이차소기빈개념,유효지소제료IMD3산생기적기빈,강저료기빈대삼차해파적간우。전로설계인입료공솔추동개념화쌍배결구,대대우화료L빈단GaN공방적IMD3분량,제승공방선성도。사용ADS2009U1연건방진실험증명,재950 MHz단음측시하,계통정체효솔가체52.1%。재945 MHz화955 MHz쌍음측시하,IMD3증가료15 dB。해예실진기실현료재저효솔손모하대선성도적우화。
The nonlinearity of RF power amplifiers when they amplify signals causes distortion,which makes a negative influence on the performance of the communication systems seriously.To improve the third order intermodulation distortion,a new analog predistortion was introduced.This predistortion used the concept of complete matching IMD3 generator and two times fundamental frequency offsetting,which eliminated the fundamental frequency of IMD3 generator and reduced interference of the fundamental frequency to three harmonics.The circuit used the concept of pushing power and dual-ring structure.It optimized IMD3 of the L frequency range of the GaN amplifier obviously to improve the linearity of amplifier.By using the ADS2009U1 software,in the 950MHz single tone signal testing environment,the experiments show that the PAE of this system reached 52.1%.Furthermore, in the 945 MHz and 955 MHz dual tone signal testing environment,IMD3 gains the improvement of 15 dB.This predistortion realized the optimization of linearity in low efficiency loss.