Authors: G.H. See, S.B. Chiah, X. Zhou, K. Chandrasekaran, W. Shangguan, Z. Zhu, G.H. Lim, S.M. Pandey, M. Cheng, S. Chu and L-C Hsia
Affilation: NTU, Singapore
Pages: 749 - 752
Keywords: short channel effects, charge model, intrinsic charges, extrinsic capacitance, bulk-charge sharing, potential barrier lowering
Short-channel effects (SCEs) for both intrinsic charges<br>and extrinsic capacitances need to be modeled when the<br>MOSFET channel is short. The intrinsic SCEs are modeled using bulk-charge sharing and quasi-two dimensional potential barrier loweirng; extrinsic overlap capacitances are derived based on unified reigonal surface potential for charges. Similar to the channel, bulk-charge sharing is also applied to the overlap LDD region. The model shows good scalability with different lengths and body biases at short channel due to physically derived intrinsic SC charges valid for all regions. Without these physically derived, bias and geometry scalable charge models, a nonscalable “core” model would have to employ empirical geometry and/or bias fitting, which will neither be accurate nor physical for short-channel small-signal ac and large signal transient analyses.