- 學位論文
使用相位可反相衰減器實現Ka頻段低增益變異之 向量合成相移器
A Ka Band Low Gain Variation Vector-Sum Phase Shifter Using Phase-Invertible Variable Attenuator
摘要
隨著科技發展，第五世代無線通訊系統(5th generation wireless system, 5G wireless system)系統即將問世，此世代的通訊系統將使用波束成形技術(beamforming)提升系統效率及傳輸品質，而相移器在波束成形技術中扮演一關鍵性的角色，故本論文提出一操作於Ka頻帶之向量合成式相移器(vector sum phase shifter, VSPS)。 本論文之相移器使用相位可反相之可調衰減器(phase-invertible variable attenuator, PIVA)做為產生正交(in-phase and qudrature, IQ)訊號的工具，並使用向量加法器，透過適當的偏壓調整合成IQ訊號，並使用電流再利用技術(currenr-reused technology)將訊號送往輸出端，以此達到放大訊號並節省功耗的目的。 電路採用台積電0.18μm CMOS製程實現，而量測結果均方根增益誤差(root mean square gain error, RMS gain error)為0.89dB，RMS相位誤差(root mean square phase error, RMS phase error)為0.56°，平均增益為-3.45dB，直流功耗最大為7.2mW，群速延遲為120.5±7.5ps。
並列摘要
With the rapid development of wireless communication systems, the 5th generation wireless system is coming out soon. The technology of beamforming is used in 5G wireless system to enhance the efficiency of system and signal transmission quality, and phase shifter plays a crucial role in this technology. In this thesis, we propose a vector sum phase shifter (VSPS) at Ka band. A phase-invertible variable attenuator (PIVA) is used in the phase shifter to generate in-phase and quadrature (I/Q) signals. The I/Q signal will be injected to vector adder to combine I/Q signal, then the combined signal goes through a common-source amplifier with current-reused technology to amplifier signal and reduce the DC power. The proposed phase shifter is implemented with TSMC 0.18μm CMOS technology. Mmeasurement results of phase shifter show root mean square gain error (RMS gain error) at 0.89dB, and root mean square phase error (RMS phase error) at 0.56°, average gain is -3.45dB, and maximum DC power is 7.2mW,and group delay is 120.5±7.5ps.