Study of Active Phased Array Using High Efficiency Class-E Injection-Locked Oscillators

• Main Authors: Wei-Chih Su, 蘇瑋智
• Other Authors: Tzyy-Sheng Horng
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/95443511360843825709

碩士 === 國立中山大學 === 電機工程學系研究所 === 104 === Since the processing of the baseband signal of 4G wireless communication has reached its limit, the solution to improve the data rate of 5G wireless communication system does not lie in the baseband signal processing. Because of that, this thesis studies a class-E injection-locked oscillator (ILO) array for use in a beam-forming system that can enhance the transmission speed. 　　Firstly, this paper designs a Class-E power amplifier (PA) as a basis of the injection-locked voltage controlled oscillator. Secondly, the feedback loop and injection port are added to the class-E PA to realize a class-E ILO. Finally, 1Χ4 ILO array is constructed and measured. 　　Due to the characteristic of the class-E circuit, the supply voltage is directly proportional to the output voltage. When all elements of array are injection-locked by the external signal, the output power of each ILO can be adjusted by the supply voltage. On the other hand, according to the lock-in time property of injection-locking, the output phase of each ILO can be adjusted by the tuning voltage applied to the varactor in the tank. Then, a local oscillator phased array with tunable output magnitude and phase is accomplished.