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 J Electromagn Eng Sci > Volume 9(4); 2009 > Article
 Journal of the Korean Institute of Electromagnetic and Science 2009;9(4):218-222. DOI: https://doi.org/10.5515/JKIEES.2009.9.4.218
 A CPW-Based 77 GHz Power Amplifier with Cascode Structure Using a 130 nm In0.88GaP/In0.4AlAs/In0.4GaAs mHEMTs Young-Min Kim, Yu-Min Koh, Young-Rak Park, Si-Young Lee, Kwang-Seok Seo, Young-Woo Kwon Institute of New Media and Communications, School of Electrical Engineering, Seoul National University Abstract In this paper, we present a CPW-based 77 GHz 3-stage power amplifier MMIC for automotive radar systems. The power amplifier MMIC has been realized using a 130 nm $In_{0.88}$GaP/$In_{0.4}$AlAs/$In_{0.4}$GaAs metamorphic high-electron mobility transistors(mHEMTs) technology and an output stage with a cascode configuration. This produced a good output power and gain performance at 77 GHz. The fabricated power amplifier MMIC exhibited a small-signal gain of 18 dB, an output power of 17 dBm and 9 % power added efficiency(PAE) at 77 GHz with a total gate width of 800 ${mu}m$ in the output stage. These performances could be useful to low-cost and small-sized components for 77 GHz automotive radar systems. Key words: Millimeter Wave, Automotive Radar, Cascode, mHEMT, MMIC, Power Amplifier, Coplanar Wave Guide
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