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We demonstrate the Au-free GaN HEMT device with the Ti/Al/W Ohmic metal structure. Excellent surface roughness 4.88nm for Ti/Al/W Ohmic stucture was achieved after metallization. The DC characteristics is comparable with conventional HEMTs and the stress performance with high voltage is better than conventional HEMTs.
This paper presents a flip-chip-on-board (FCOB) packaging technology using a Rogers RO3210 laminate for microwave applications. Compared to the conventional microwave packaging architecture, the proposed FCOB technology skips one level of the ceramic package and thus results in lower reflections and manufacturing costs. To fulfill the small dimension requirement on printed circuit boards, the coplanar...
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