On the performance limits of cryogenically operated SiGe HBTs and its relation to scaling for terahertz speedsJiahui YuanJohn D. Cressleret al.2009IEEE Transactions on Electron Devices
An investigation of negative differential resistance and novel collector-current kink effects in SiGe HBTs operating at cryogenic temperaturesJiahui YuanJohn D. Cressleret al.2007IEEE Transactions on Electron Devices