A High-Linear Radio Frequency Quadrature Modulator with Improved Sideband Suppression and Carrier Leakage Performance  

作　　者：Yingdan Jiang Zongguang Yu Shutong Wu Li Li Xuelian Liu 

机构地区：[1]School of Electronic Science and Engineering,Nanjing University,Nanjing 210093,China [2]The 58th Research Institute of China Electronic Technology Group Corporation,Wuxi 214072,China

出　　处：《Tsinghua Science and Technology》2024年第3期635-643,共9页清华大学学报（自然科学版（英文版）

基　　金：supported by the National Natural Science Foundation of Jiangsu Province(No.BK20211042);the National Natural Science Foundation of China(No.62174149)。

摘　　要：The quadrature modulator is a crucial block in transmitters that upconverts baseband signals to theRadio Frequency(RF)band of interest using local oscillator frequencies.In this paper,non-ideal factors thatinfluence the performance of the quadrature modulator are considered,and solutions are accordingly taken inthe quadrature modulator design.A high-linear RF quadrature modulator with improved sideband suppressionand carrier leakage performance is presented in this work.The quadrature modulator implemented in the0.18-μm SiGe process uses the current bleeding technique to improve the general performance of the doublebalanced active Gilbert mixers.An on-chip prescaler followed by two cascaded limiting amplifiers is designed toprovide accurate quadrature local oscillator signals.Predrivers at quadrature baseband signal input ports areproposed to eliminate DC offsets.The measured sideband suppression achieves a performance of better than−43 dBc and carrier leakage is less than−38 dBm over the output RF frequency range of 30 MHz to 2.15 GHz.The output 1 dB compression point equals 11.4 dBm at 800 MHz.

关 键 词：Radio Frequency(RF) quadrature modulator sideband suppression carrier leakage LINEARITY 

分 类 号：TN925[电子电信—通信与信息系统]