應用於5G行動通訊之毫米波可變增益放大器設計

Abstract

行動通訊系統的需求日益增加，毫米波的研究發展逐漸被重視，其中更高速的傳輸速率、更寬的頻寬以及低延遲的優點，使其更受到矚目。本論文設計兩顆應用於毫米波頻段的電路，第一個電路為28 GHz可變增益放大器，設計一傳統收發機中的可變增益放大器，使用一級 電流控制架構搭配基極偏壓技術，以達成高可變增益範圍的電路，此顆電路在28 GHz時增益S21約為20.76 dB，可變增益範圍約9.25 dB， OP1dB約為0.425 dBm，整體功率約為20.4 mW。整體晶片佈局面積為420 μm × 630 μm。第二顆電路將應用相位陣列天線中，有別於第一顆放大器，此電路更要求相位差，使用一級電流控制架構搭配基極偏壓技術，以達成高可變增益範圍的電路，在可變增益範圍維持的情況使用共振腔及相位反轉技術達到低相位變化，此外第二顆電路涵蓋大部分毫米波頻段，在這顆電路中，成功地實現 27GHz ～ 43 GHz 增益大於15 可變增益範圍大於 8 且相位差低於 5 度的要求。The demand of mobile communication systems is increasing, the development of millimeter waves is gradually being important. It has been attention by the advantage of the high transmission rate, wide bandwidth and low delay.First, a 28 GHz VGA has designed and implemented. The circuit adopted current steering stages. We utilized digital control to maintain the variable gain range and reduce control complexity of system. When the supply voltage is 1.2 V, Vg1 and Vg2 is 0.6 V and 1.2 V, the peak gain is 20.76 dB at 28 GHz. GCR is 9.25 dB, OP1dB is 0.425 dBm, Power comsumption is 20.4 mW, The area of chip is 420 μm × 630 μm.Second, a 27 GHz to 43 GHz VGA has designed and implemented. The circuit adopted current steering stages and phase compensation techniques. When the supply voltage is 1.2 V, Vg1 and Vg2 is 0.6 V and 1.2 V, The peak gain is higher than 15 dB.The phase is lower than 5 degree.