Active Phased Array Radar with IF Phase Shifters

• Main Authors: Ke, Cheng-Yung, 柯承詠
• Other Authors: Wang, Yu-Jiu
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/z8yy35

碩士 === 國立交通大學 === 電子研究所 === 107 === This paper introduces an active phased array radar with the basic architecture and measurement analysis. This radar is based on 35 GHz scalable four-element phased array ICs in 65-nm CMOS. The phased array utilizes a homodyne topology and implements the phase shifter in IF. The DC bias of whole system is generated by a low supply voltage bandgap reference. The system uses direct-coupled standing wave oscillator array to simplify the LO routing. Each receiver has 66 dB conversion gain and 4.4 dB noise figure. And each transmitter output can reach 18.5 dBm output power at 35GHz. The radar uses embedded Vivaldi antennas to receive and transmit RF signal. A 1.09-GHz and a 50-MHz clock trees synchronize the analog and digital signals of all array elements respectively. To enhance phase stability, this paper introduces the concepts of thermal controller and thermal-feedback loop which stabilize temperature to a specific value. The IF phase shifter testkey IC solves some existing bugs and might simplify the calibration flow of phased array chips in the future.