T. Shimura et al., 1 W KU-BAND ALGAAS GAAS POWER HBTS WITH 72-PERCENT PEAK POWER-ADDED EFFICIENCY/, I.E.E.E. transactions on electron devices, 42(11), 1995, pp. 1890-1896
High power and high-efficiency multi-finger heterojunction bipolar tra
nsistors (HBT's) have been successfully realized at Ku-band by using a
n optimum emitter ballasting resistor and a plated heat sink (PHS) str
ucture. Output power of 1 W with power-added efficiency (PAE) of 72% a
t 12 GHz has been achieved from a 10-finger HBT with the total emitter
size of 300 mu m(2). 72% PAE with the output power density of 5.0 W/m
m is the best performance ever reported for solid-state power devices
with output powers more than 1 W at Ku-band.