Fig. 1.
Complete small-signal equivalent circuit of HBT device including ${C_{{\rm{bi}}}} $![]()
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. $ {{{g}}_{\rm{m}}}{\rm{ = }}{g_{{\rm{m0}}}}{{\rm{e}}^{-j\omega \tau }}$![]()
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Jinjing Huang, Jun Liu. A complete small-signal HBT model including AC current crowding effect[J]. Journal of Semiconductors, 2021, 42(5): 052401. doi: 10.1088/1674-4926/42/5/052401
J J Huang, J Liu, A complete small-signal HBT model including AC current crowding effect[J]. J. Semicond., 2021, 42(5): 052401. doi: 10.1088/1674-4926/42/5/052401.
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A complete small-signal HBT model including AC current crowding effect
doi: 10.1088/1674-4926/42/5/052401
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Abstract
An improved small-signal equivalent circuit of HBT concerning the AC current crowding effect is proposed in this paper. AC current crowding effect is modeled as a parallel RC circuit composed of Cbi and Rbi, with distributed base-collector junction capacitance also taken into account. The intrinsic portion is taken as a whole and extracted directly from the measured S-parameters in the whole frequency range of operation without any special test structures. An HBT device with a 2 × 20 μm2 emitter-area under three different biases were used to demonstrate the extraction and verify the accuracy of the equivalent circuit.-
Keywords:
- small-signal model,
- HBT,
- AC current crowding effect
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References
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