Development of K- and Ka-band High-Power Amplifier GaN MMIC Fabrication Technology
Int. Conf. on Compound Semiconductor Manufacturing Technology (CS ManTech 2016), Miami, USA, May 16-19, pp. 31-34 (2016).
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In the present work, we compare two different embedded-gate technologies used for the fabrication of 150 nm AlGaN/GaN HEMTs intended for K- and Ka-band satellite communication applications. DC performance of fabricated transistors has been similar for both technologies. Load-pull measurements at Vds = 28 V, Ids = 30 % Idsmax and tuned for the maximum Pout showed more than 5.5 W/mm power density at 20 GHz operation for 4×75 µm devices, regardless of the gate technology. DIVA (pulsed I-V) measurements unveiled the first advantage of sputtered iridium gate technology - a significant reduction of gate lag. High-temperature reverse-bias test (HTRB) showed significant degradation of the Schottky barrier for all samples. At the same time, maximum drain current degradation and increase of drain pinch-off current for sputtered Ir gates was less pronounced as compared to e-beam evaporated Ir technology. High-temperature operation test (HTO) demonstrated Schottky barrier increase due to thermal annealing and the filling of deep donor traps on the metal/semiconductor interface by hot electrons generated during the transistor operation.
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin
Ka-band, GaN HEMT, MMIC process.