Ka-band IQ vector modulator employing GaAs HBTs  

作　　者：曹玉雄 吴旦昱 陈高鹏 金智 刘新宇 

机构地区：[1]Institute of Microelectronics,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2011年第6期91-95,共5页半导体学报（英文版）

基　　金：Project supported by the State Key Development Program for Basic Research of China(No2010CB327505)

摘　　要：The importance of high-performance,low-cost and millimeter-wave transmitters for digital communications and radar applications is increasing.The design and performance of a Ka-band balanced in-phase and quadrature-phase（I-Q）type vector modulator,using GaAs heterojunction bipolar transistors（HBTs）as switching elements,are presented.The balanced technique is used to remove the parasitics of the HBTs to result in near perfect constellations.Measurements of the monolithic microwave integrated circuit（MMIC）chip with a size of 1.89×2.26 mm^2 demonstrate an amplitude error below 1.5 dB and the phase error within 3°between 26 and 40 GHz except for a singular point at 35.6 GHz.The results show that the technique is suitable for millimeter-wave digital communications.The importance of high-performance,low-cost and millimeter-wave transmitters for digital communications and radar applications is increasing.The design and performance of a Ka-band balanced in-phase and quadrature-phase（I-Q）type vector modulator,using GaAs heterojunction bipolar transistors（HBTs）as switching elements,are presented.The balanced technique is used to remove the parasitics of the HBTs to result in near perfect constellations.Measurements of the monolithic microwave integrated circuit（MMIC）chip with a size of 1.89×2.26 mm^2 demonstrate an amplitude error below 1.5 dB and the phase error within 3°between 26 and 40 GHz except for a singular point at 35.6 GHz.The results show that the technique is suitable for millimeter-wave digital communications.

关 键 词：Ka band vector modulator QPSK MMIC HBT 

分 类 号：TN761[电子电信—电路与系统]