Sotoodeh, M., Khalid, A.H., Sheng, H., Amin, F.A., Gokdemir, T., Rezazadeh, A.A., Knights, A.P., and Button, C.C. (1999) Direct extraction and numerical simulation of the base and collector delay times in double heterojunction bipolar transistors. IEEE Transactions on Electron Devices, 46(6). pp. 1081-1086. (doi:10.1109/16.766867 )
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A new method is presented to evaluate the base and collector transit times, τB and τC in heterojunction bipolar transistors (BBT's) from the phase and magnitude of the common-base current gain, α(ω), which itself was directly extracted from measured S-parameter data. The method is applied to InGaP/GaAs single and double HBT's. A smaller cutoff frequency in the latter device is attributed to τB and τC due to two effects: trapping of electrons in the conduction band triangular barrier existing at the base-collector (B-C) heterojunction and smaller saturation velocity of electrons in InGaP as compared to GaAs. Finally, a new B-C design of InGaP/GaAs DNBT's is proposed to partially compensate the transit time effects. Numerical simulation of the cutoff frequency demonstrates the superiority of the proposed structure for high-frequency applications
|Glasgow Author(s) Enlighten ID:||Khalid, Dr Ata-ul-Habib|
|Authors:||Sotoodeh, M., Khalid, A.H., Sheng, H., Amin, F.A., Gokdemir, T., Rezazadeh, A.A., Knights, A.P., and Button, C.C.|
|Subjects:||Q Science > QC Physics|
|College/School:||College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering|
|Journal Name:||IEEE Transactions on Electron Devices|