Design of CMOS Reconfigurable Passive Down-conversion Mixer for LTE MTC Receiver

6th Annual 2018 International Conference on Geo-Spatial Knowledge and Intelligence

Fan, Xiangning^1 ; Tao, Jian^1 ; Shan, Fakun^1

Institute of RF-andOE-ICs, School of Information Science and Engineering, Southeast University, Nanjing

210096, China^1

关键词: Adjustable bandwidth;    Downconversion mixer;    Reconfigurable;    RF CMOS technology;    Tow-Thomas structure;    Transconductance stage;    Transconductors;    Voltage supply;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/234/1/012107/pdf
DOI  :  10.1088/1755-1315/234/1/012107

来源: IOP

【 摘 要 】

A reconfigurable passive down-conversion mixer is fabricated in standard 65nm TSMC RF CMOS technology and presented in this paper. Different from traditional mixers, transconductor stage in this design is variable, and the transconductance stage uses a second-order low-pass transimpedance amplifier composed of Tow-Thomas structure to form a current-limited filter with adjustable bandwidth. From 900MHz to 1920MHz, The mixer circuit achieves flexible gains(5/11/19/26dB) and variable IF bandwidth(5/7.5/10MHz) with 4-bit control words, while linearity, noise figure and other indicators will also be adapted to suit the requirements of different communication standards.Under the maximum gain, its noise figure NF is 7.8dB; and under the minimum gain, its IIP3 is about 14.6dBm. It drains a current of 3.4/6.3mA from a 1.2V voltage supply at different gain mode.