Design of MMIC Components for Millimeter-Wave Receivers

• Main Authors: Shufen Wei, 魏淑芬
• Other Authors: Huei Wang
• Format: Others
• Language: en_US
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/88196637527435525433

碩士 === 國立臺灣大學 === 電信工程學研究所 === 89 === Low noise amplifiers and mixers are essential components in communication system front end in wireless local area networks, satellite links, and radiometric sensors. The LNA dominates the noise figure and input VSWR of the overall system because it is the first component received the signal from the antenna. Mixer performs the frequency transformation of the communication link. This thesis is divided into three main parts. The first part briefly introduces the basics of the mixers and the analysis of the anti-parallel diode pair mixing structure. The second part is the design of W-band and Q-band MMIC sub-harmonically pumped (SHP) mixers. The third part is the design of a K-band and a Q-band LNA. The W-band SHP mixer utilizes the second harmonic of the local oscillation signal (LO at 42.5GHz) to perform the mixing with the RF signal. The measurement results showed a conversion loss of 21 dB with IF from 10-15 GHz at 42.5 GHz LO drive of 13 dBm. The model of the Schottky diode used in the mixer design is also discussed. The equivalent circuit model is modified by curve-fitting the measured results. To obtain a design with larger bandwidth, the W-band SHP mixer is redesigned according to the refined model. The measured results showed a conversion loss of 17 dB with IF from 1-20 GHz at 42.5 GHz LO drive of 10 dBm. The Q-band SHP mixer uses the GCPW (Grounded Coplanar Waveguide) as the transmission line. It utilizes the 8th harmonic of the local oscillation signal (LO at 4.25GHz) to mix with the RF signal. The simulated results showed a conversion loss of 20 dB with IF around dc at 4.25 GHz LO drive of 15 dBm. Since the design is still in fabrication, only the simulated results are shown in this thesis. The K-band two-stage LNA achieved a small signal gain of 22.5dB at 24GHz, and the Q-band three-stage LNA achieved 24dB at 40GHz.