| HBT Parameters |  | SHBT | DHBT1 | DHBT2 | DHBT3 | 
                     
                       | Emitter Size |  | 1umx3um | 1umx3um | 0.8umx3um | 0.8umx3um | 
                     
                       | Typical operating current density | Jc(typ) | 1mA/mm2 | 1 mA/mm2 | 2 mA/mm2 | 2 mA/mm2 | 
                     
                       | Maximum operating current density | Jc(max) | 2 mA/mm2 | 2 mA/mm2 | 3 mA/mm2 | 3 mA/mm2 | 
                     
                       | Typical operating voltage | Vce | 1 V | 1.5V | 1.5 V | 1 V | 
                     
                       | Base-collector breakdown voltage | BVcbo | 4 V | 8 V | 5.5 V | 4.5 V | 
                     
                       | Collector-emitter breakdown voltage | BVceo | 3.5 V | 7 V | 4.5 V | 3.8 V | 
                     
                       | Emitter-base breakdown voltage | BVebo | 2 V | 2 V | 2 V | 2 V | 
                     
                       | Thermal resistance | Rth | 9.9°C/mW | 5.3°C/mW | 5.3°C/mW | 5.3°C/mW | 
                     
                       | fT (at Max allowed operating current) |  | 180GHz | 150 GHz | 250 GHz | 300 GHz | 
                     
                       | fmax (at Max allowed operating current) |  | 180 GHz | 150 GHz | 240 GHz | 250 GHz |