Impact of Source Resistance on Linearity of AlGaN/GaN HEMTs at Ka-Band

Ping Hsun Lee*, Yueh Chin Lin, Chi Chun Chiang, Kuan Hsien Lai, Heng Tung Hsu, Pin Su, Edward Yi Chang*


研究成果: Article同行評審


The impact of the source resistance (RS) on the linearity of AlGaN/GaN high electron mobility transistors (HEMTs) measured by the two-tone test is investigated in this study. The theoretical analysis of the third-order intermodulation (IM3) and the third-order intercept point (IP3) of the devices was performed based on the equivalent circuit approach and the polynomial curve fitting technique. The results revealed that the suppression of IM3 level and thus the improvement of IP3 were achieved for the device with a larger RS. For the experimental verifications, three types of AlGaN/GaN HEMTs were fabricated with different layout structures and air-bridge architectures corresponding to different RS values, which were then extracted by the cold-FET method. It is concluded that a device with a shorter length of middle source pad (LMS) and a side-type air-bridge architecture tends to have a larger RS value. In this study, the 4 × 50-20 device with LMS of 20 um and a side-type air-bridge architecture demonstrated the best-measured linearity performance at 30 GHz due to the largest RS.

期刊ECS Journal of Solid State Science and Technology
出版狀態Published - 10月 2023


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