Electrical Compact Modeling of SiGe Phototransistor: Impact of the Distributed Nature on Dynamic Behavior

This article presents and analyzes an improved electrical compact model of SiGe/Si-double heterojunction bipolar phototransistors (HPT). This is a complete one, operating in dc, in nonlinear large-signal ac mode and in optomicrowave operating. This HPT was fabricated based on an existing industrial SiGe heterojunction bipolar transistor (HBT) Telefunken GmbH technology. Several deviations from the...