Tungsten metallization technology has been developed for high temperat
ure silicon-on-insulator devices and circuits. The experiments on tung
sten evaporation, plasma etching, annealing and lift-off process for t
he contact pad will be described in detail. Contact resistances were m
easured and compared with that of an aluminum metallization system. No
significant degradation was observed by static measurement from room
temperature up to 320 degrees C.