The effects of geometrical scaling on the RF performance of SiGe HBTs

We examine the geometrical scaling issues in SiGe HBT technology. Width scaling, length scaling, and stripe number scaling are quantified from an RF design perspective at 2 GHz. We conclude that a SiGe HBT with emitter area A/sub E/=0.5/spl times/20/spl times/6 /spl mu/m/sup 2/ is optimum for low noise applications at J/sub c/=0.1 mA//spl mu/m/sup 3/ and f=2 GHz.