Si/SiGe power heterojunction bipolar transistors (HBTs) grown by MBE w
ere dynamically characterised in the common-base configuration. At an
emitter current density of 1.1x10(5) A/cm2, a maximum frequency of osc
illation of 49GHz was observed. At 10GHz a maximum unilateral gain of
14dB is available, and a CW output power of 1.3W/mm for a device with
10 parallel emitter-fingers of 1x10mum2 each was predicted, from CW me
asurements.