Modelingand Analysis of a Uni-traveling Carrier Phototransistor Based on its Small Signal Equivalent Circuit - Details

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Abstract：

The　small　signal　equivalent　model　of　a　Uni-Traveling　Carrier　Double　Hetero-junction　Phototransistor　(UTC-DHPT)　was　established.　In　this　model,　the　optical　generated　current　in　UTC-HPT　was　introduced　reasonably　as　part　of　base　current.　The　influence　of　single　carrier　transportation　in　UTC-DHPT　on　photo　transconductance,　emitter　junction　effective　resistor,　emitter　junction　capacitor,　and　collector　junction　capacitor　were　analyzed.　Based　on　the　established　small　signal　equivalent　model,　the　dependence　of　optical　characteristic　frequency　and　the　optical　generated　current　gain　on　optical　window　area　and　illumination　light　power　of　an　InP-based　UTC-DHPT　were　analyzed.　At　certain　illumination　light　power,　there　is　an　optimum　window　area　which　can　achieve　the　maximum　optical　characteristic　frequency.　Meanwhile,　the　optimum　window　area　would　change　in　certain　range　as　illumination　light　power　increasing.　When　chosen　the　optical　injection　window　of　8×8　μm2,　With　the　gradual　increase　of　illumination　light　power,　the　characteristic　frequency　increases　at　first　and　then　decreases,　the　highest　value　reaches　150　GHz　at　280　μW.　The　gain　of　optical　generated　current　increases　gradually　too　and　reaches　the　saturation　gain　of　82　dB　under　750　μW.　©　2017,　Science　Press.　All　right　reserved.

Keyword：

III-V semiconductors Equivalent circuits Semiconducting indium phosphide Optical materials Phototransistors Timing circuits Indium phosphide

Author Community：

[ 1 ] [Sun, Dan]College of Electronic Science and Technology, Faculty of Information Technology, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Xie, Hong-Yun]College of Electronic Science and Technology, Faculty of Information Technology, Beijing University of Technology, Beijing; 100124, China
[ 3 ] [Liu, Rui]College of Electronic Science and Technology, Faculty of Information Technology, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Liu, Shuo]College of Electronic Science and Technology, Faculty of Information Technology, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Wu, Jia-Hui]College of Electronic Science and Technology, Faculty of Information Technology, Beijing University of Technology, Beijing; 100124, China
[ 6 ] [Zhang, Wan-Rong]College of Electronic Science and Technology, Faculty of Information Technology, Beijing University of Technology, Beijing; 100124, China

Reprint Author's Address：

[xie, hong-yun]college of electronic science and technology, faculty of information technology, beijing university of technology, beijing; 100124, china

Email：

xiehongyun@bjut.edu.cn

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