摘要
传统射频调制采用先调制后上变频和功放的模式,电路复杂且功放效率低。多端口直接射频调制技术采用先功放后调制模式,无需有源混频器,简化了电路,提高了杂散性能和功放效率。因此,给出了一种3~12 GHz频段的射频直接调制方法,经ADS仿真EVM值不超过1.2%。通过对多端口S参数进行分析,确定模块的设计参数,采用切比雪夫阻抗变换法和电容补偿法来改进其宽带特性。有限元法分析表明,在3~12 GHz频带内能够满足宽带直接射频调制的需要,并通过HFSS完成了性能仿真验证。
The traditional radio frequency （RF） modulation adopts the modulation first and then followed by the frequency up-conversion and power amplifier （PA） mode, and this would lead to high circuit- complexity and low PA efficiency. Direct RF multi-port modulation scheme adopts PA and followed by modulator, this could simplify the circuit complexity without active mixer and improve the system performance . Therefore, a radio frequency direct modulation method for 3~12 GHz frequency band is proposed. The EVM value of ADS simulation is not more than 1.2%. Through analysis on the multi-port S parameters, the design parameters of the module are determined. The wide-band characteristics are improved by using Chebyshev impedance transformation method and the capacitance compensation method. The finite element analysis indicates that the method can meet the needs of wideband direct radio frequency modulation in the 3~12 GHz frequency band. The final performance simulation is performed by using HFSS.
作者
刘保方
张泽胜
LIU Bao-fang;ZHANG Ze-sheng(School of Communication Engineering, Hangzhou Dianzi University, Hangzhou Zhejiang 310018, China)
出处
《通信技术》
2018年第1期41-46,共6页
Communications Technology
关键词
微波
直接调制
多端口
宽带补偿
超宽带
microwave
direct modulation
multi-port
broadband compensation
ultra-wideband
