Backside-emitter-structure C-up GaAs HBTs for small power amplifiers

Abstract

In this paper, we have successfully fabricated ballast-free HBTs with L of 15 /spl mu/m and V/sub ce,.sat/ of 0.01 V by employing a backside-emitter-structure collector-up (C-up) configuration with ohmic collector contacts. Preliminary results on performance of these HBTs show their strong potential for application in small and highly efficient PA MMICs.