Electrical Engineering
      and Computer Sciences

Electrical Engineering and Computer Sciences


UC Berkeley


2010 Research Summary

Double-Gate MOSFET Modeling: Asymmetric DG (BSIM)

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Darsen Duane Lu, Chung-Hsun Lin, Mohan Vamsi Dunga, Tianjiao Zhang, Chenming Hu and Ali Niknejad

Semiconductor Research Corporation 1451.001

The independent double-gate field-effect transistors (IDG-FETs) (Figure 1) allows the tuning of threshold voltage by changing the back-gate voltage. This provides circuit designers with additional flexibility to resolve the tradeoff between circuit speed and power consumption. However, existing compact models (or SPICE models) do not address independent gates. The goal of this project is to develop a compact model (SPICE model) for IDG-FETs.

We have developed the core I-V and C-V model for IDG-FET and verify it with TCAD simulations [1]. Many real device effects such as mobility degradation, velocity saturation, quantum effects, short channel effects, parasitic resistances and capacitances, impact ionization, leakage current components and many others have been incorporated into the model. It is successfully implemented in the Verilog-A language and can be used in most commercial circuit simulators.

The model is currently being verified against measured I-V and C-V data.

Figure 1
Figure 1: (a) Bulk FinFET with two independent gates; (b) SOI FinFET with independent gates; (c) Back-gated SOI MOSFET

D. D. Lu, M. V. Dunga, C.-H. Lin, A. M. Niknejad, and C. Hu, "A Multi-Gate MOSFET Compact Model Featuring Independent-Gate Operation," IEDM, 2007.