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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/2110

Title: Profile design considerations for minimizing base transit time in SiGe HBT's
Authors: Patri, V S
M J Kumar
Keywords: trapezoidal Ge profile
Issue Date: 1997
Citation: Electron Devices, IEEE Transactions on, 45(8), 1725 - 1731p.
Abstract: A unified closed form analytical model for base transit time of SiGe HBT's for uniform and exponential base dopant distributions with different Ge profiles in the base (e.g., box, trapezoidal, triangular) is reported. The model is subsequently used to study the design of Ge profile for different base doping profiles, including that of epitaxial base transistors. Consistent with the reported results, our unified model predicts that beyond a certain total Ge content, there is very little reduction in τb.SiGe. It is further demonstrated that the trapezoidal Ge profile with XT~0.8WB gives near optimal base transit time for all doping profiles considered. Our analysis shows that 1) for a given base width and intrinsic base resistance, the exponential base doping profile with Ge yields the least value of τb, SiGe and 2) for a given peak base doping concentration and the intrinsic base resistance, the uniform base doping with Ge gives minimum τb, SiGe. Also, the need for keeping the total base Ge content constant while optimizing the Ge profile in the base is emphasized by showing that a false minimum for τb, SiGe may appear if the total Ge content is not kept constant
URI: http://eprint.iitd.ac.in/dspace/handle/2074/2110
Appears in Collections:Electrical Engineering

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