Design and Implementation of CMOS Even Harmonic Mixers for Wireless-Communication Receivers

• Main Authors: Ming-Feng Huang, 黃敏峰
• Other Authors: Chung J. Kuo
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/90075064344106097303

博士 === 國立中正大學 === 電機工程研究所 === 94 === Four CMOS even harmonic mixers (EHM) for wireless-communication receivers are proposed in this dissertation. The first EHM with current reuse technique is presented for solving the problems of isolations for super-heterodyne receivers and time-varying DC offset for direct conversion receivers. Moreover, this EHM has the advantages of low power consumption and high conversion gain for 900 MHz applications. The second 5.25 GHz low-voltage EHM with folded-cascode technique, so-called FEHM, for solving the asymmetric problem of the first EHM is also presented. In order to overcome the operational-frequency limitation of the first EHM, the third EHM employing an enhancing inductance between the LO and RF stages is presented to improve the linearity and conversion gain at the 5.25 GHz operational frequency. The fourth EHM using a dual Class-AB circuit operated at the 5.25 GHz is presented. This EHM provides higher conversion gain and linearity; moreover, it overcomes the process and bonding-wire variations by the proposed dual Class-AB circuit. In order to get the most advantages of the proposed EHMs, the theoretical analyses, such as conversion gain, linearity, noise figure (NF), are also presented and verified by the simulation and chip measurement. On the other hand, the proposed EHMs fabricated by TSMC 0.18 μm CMOS process provide advantages, such as lower power consumption, higher power conversion gain, and higher linearity compared with the existing mixers.