Sub-harmonic Mixer, Phase Shifter and Quadrature Frequency Divider for RF Front-end System Applications

• Main Authors: Chia-ChenHuang, 黃嘉蓁
• Other Authors: Yeong-Her Wang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/12960124101116805869

碩士 === 國立成功大學 === 微電子工程研究所碩博士班 === 100 === This thesis focuses on the design of microwave and millimeter-wave front-end circuits. It is divided into three parts. A wideband sub-harmonic pumped mixer using WIN 0.15 m pHEMT is the first challenge. The bandwidth limitation of traditional circuits using quarter-wavelength microstrip lines has been solved. A new type of balun is proposed, which can provide both the functions of power division and balance-to-unbalance transformation. The bandwidth is extended to 37-80 GHz and also the size is reduced. In the second part of this thesis, a 36 GHz adjustable four-bit phase shifter is realized. It consists of three high-pass filters and one 180° phase shifter based on high-pass/low-pass filter structures. Diode switches are used instead of their FET counterparts. They need only about half of the bias power sources and significantly reduce the circuit complexity. It achieves a 4-bit 360° phase-tuning range, while the variation of the insertion losses is low. The insertion loss is 12.5±1.5dB at 36 GHz. The return losses are better than 10dB. Finally, a quadrature phase divided-by-three frequency divider for 24GHz automotive collision avoidance radars is realized by TSMC 90 nm process. From the results of the simulations, it is observed that the frequency tuning range of this regenerative divider is wide, from 17 GHz to 25 GHz (38%), with very low phase noise, about -145.5 dBc/Hz one MHz away from the carrier.