Accurate statistical circuit simulation in the presence of statistical variability

Asenov, Plamen (2013) Accurate statistical circuit simulation in the presence of statistical variability. PhD thesis, University of Glasgow.

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Semiconductor device performance variation due to the granular nature of charge and matter has become a key problem in the semiconductor industry. The main sources of this ‘statistical’ variability include random discrete dopants (RDD), line edge roughness (LER) and metal gate granularity (MGG). These variability sources have been studied extensively, however a methodology has not been developed to accurately represent this variability at a circuit and system level. In order to accurately represent statistical variability in real devices the GSS simulation toolchain was utilised to simulate 10,000 20/22nm n- and p-channel transistors including RDD, LER and MGG variability sources. A statistical compact modelling methodology was developed which accurately captured the behaviour of the simulated transistors, and produced compact model parameter distributions suitable for advanced compact model generation strategies like PCA and NPM. The resultant compact model libraries were then utilised to evaluate the impact of statistical variability on SRAM design, and to quantitatively evaluate the difference between accurate compact model generation using NPM with the Gaussian VT methodology. Over 5 million dynamic write simulations were performed, and showed that at advanced technology nodes, statistical variability cannot be accurately represented using Gaussian VT . The results also show that accurate modelling techniques can help reduced design margins by elimiating some of the pessimism of standard variability modelling approaches.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: Statistical Variability, MOSFET, compact models, SRAM, simulations
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Colleges/Schools: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Funder's Name: UNSPECIFIED
Supervisor's Name: Roy, Prof. S.
Date of Award: 2013
Depositing User: Mr P Asenov
Unique ID: glathesis:2013-4996
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 06 Mar 2014 08:28
Last Modified: 06 Mar 2014 08:30

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