Research on Double-balanced Active Mixer and Millimeter-wave Switch for Beam-steering System

• Main Authors: Dong-Ru Lin, 林東儒
• Other Authors: Kun-You Lin
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/81230271219969034616

碩士 === 國立臺灣大學 === 電信工程學研究所 === 105 === The switch function is extensively employed in RF systems, especially with the development of the multi-mode and multi-band transceivers. The loss of switch degrades the NF and PAE of transceiver. In Chapter 2, the SPDT switch is applied in 40-nm LP CMOS process for 60 GHz, which targets on minimizing insertion loss. The body-floating technology is used to reduce insertion loss, and the architecture consists of equivalent capacitor of turn-off MOS, series transmission line and open stub to form πmatching network. In Chapter 3, the SP4T absorptive switches are applied in 40-nm LP CMOS process for 38 and 60 GHz. By analyzing required value of isolation of absorptive switch for Butler matrix, the absorptive switch is designed for minimizing insertion loss. The proposed topology minimizes chip sizes and insertion loss. Moreover, the absorptive switch with 4×4 Butler matrix in 40-nm LP CMOS process for 38 GHz is realized. In Chapter 4, the 60 GHz IQ sub-harmonic mixer is presented using 40-nm LP CMOS process, which produces sub-harmonic mixing by the non-linearity of transistor. The double-balanced topology pumped by a differential LO signal is adopted, which can obtain the benefit of smaller area and lower LO power. Transformer-based current-type combining is adopted to reduce chip area and loss of matching network. The automotive short-distance radar is permitted to use 24 GHz, the mixer play an important role in transceiver. In Chapter 5, the current bleeding with neutralization is proposed. The 24 GHz down-conversion mixer with this current bleeding is implemented using 0.18-µm CMOS process. The IP1dB of proposed current bleeding is better than 6 dBm IP1dB of traditional PMOS current bleeding. The IM3 of proposed way is lower than 7 dBm IM3 of traditional way in IP1dB of traditional current bleeding.