Design of Microwave Baluns and Applied to Development CMOS Singly Balanced Mixer

• Main Authors: Chih-Che Lin, 林智哲
• Other Authors: Chao-Hsiung Tseng
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/90143553315930335891

碩士 === 國立臺灣科技大學 === 電子工程系 === 102 === The aim of this thesis focuses on the development of four baluns, which include three types of broadband baluns and one dual-band rat-race coupler fabricated in printed circuit board (PCB) and glass integrated passive devices (GIPD) process. The circuit design procedures, implementations, and experimental results are presented in this thesis. In addition, a CMOS singly balanced mixer with the Marchand balun is also realized to reveal the balun application. The PCB Wilkinson balun utilizes the asymmetrical T-structure Wilkinson power divider and composite right/left hand transmission line to synthesize a phase difference of 180°. As considering the return loss and isolation of better than 10 dB, amplitude imbalance of less than 0.6 dB and 180°±3° output phase difference, the relative bandwidth of developed balun is about 72.2 %. Broadband fourth-order balun is composed of the microstrip line, coplanar strip line and slot line. As considering the return loss of better than 10 dB, amplitude imbalance of less than 0.55 dB and a 180°±3° output phase difference, the relative bandwidth of developed balun is about 144.8 %. The CMOS singly balanced mixer has a conversion loss of better than 16 dB from 14 GHz to 26 GHz as the intermediate frequency is set to 100 MHz. The GIPD dual-band rat-race coupler is designed using dual-band π structures. As considering the return loss of better than 10 dB, the relative bandwidth of the dual-band coupler in the first and second passbands are 62 % and 27 %, respectively. Moreover, broadband balun using the composite right/left-handed transmission line is also implemented in the GIPD process. As considering the return loss of better than 10 dB, the amplitude imbalance of less than 0.8 dB and a 180°±4° output phase difference, the relative bandwidth of the developed balun is about 75.9 %.