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Proceedings Paper

Tuned MEDICI simulator including inverse short channel effect for sub-0.18-μm CMOS technologies
Author(s): Mahalingam Nandakumar; S. Sridhar; Karthik Vasanth; Jerry C. Hu; Wei-Tsun Shiau; P. Mei; Mark Rodder; Ih-Chin Chen
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Paper Abstract

This paper describes device simulation using a simulator (MEDICI) which is tuned to accurately predict the I-V characteristics of MOSFETS with conventional (non-pocket) channel profiles or pocket implants, and physical gate lengths from 10 micrometer to 0.16 micrometer. The key features of the simulation are, (1) the addition of a doping profile correction to the channel in NMOSFETs to model the inverse (reverse) short channel effect (ISCE/RSCE), (2) the incorporation of a new model to describe the pocket implant profile, and (3) the use of a two-step doping profile in the polysilicon gate to model gate depletion. The estimation of parameters for the profile correction and the pocket implant model, and the procedure of matching the simulated and experimental threshold voltage (VT) as a function of gate length is described for the first time in this paper. The two- step gate doping profile, mobility parameters, external source-drain resistance Rsd and saturation velocity Vsat, used in the simulation, are determined by comparing the experimental and simulated C-V and I-V characteristics using the methodology discussed in reference 4. Good agreement between measured and simulated device characteristics is demonstrated for NMOS and PMOS devices with conventional profiles and pocket implants with varying doses, at supply voltages of 1 and 1.5 V.

Paper Details

Date Published: 27 August 1997
PDF: 12 pages
Proc. SPIE 3212, Microelectronic Device Technology, (27 August 1997); doi: 10.1117/12.284606
Show Author Affiliations
Mahalingam Nandakumar, Texas Instruments Inc. (United States)
S. Sridhar, Texas Instruments Inc. (United States)
Karthik Vasanth, Texas Instruments Inc. (United States)
Jerry C. Hu, Texas Instruments Inc. (United States)
Wei-Tsun Shiau, Texas Instruments Inc. (United States)
P. Mei, Texas Instruments Inc. (United States)
Mark Rodder, Texas Instruments Inc. (United States)
Ih-Chin Chen, Texas Instruments Inc. (United States)


Published in SPIE Proceedings Vol. 3212:
Microelectronic Device Technology
Mark Rodder; Toshiaki Tsuchiya; David Burnett; Dirk Wristers, Editor(s)

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