AC Device Variability in High-[Formula Omitted] Metal-Gate CMOS Technology

The variability of CMOS device propagation delay is measured with a special test circuit. The circuit detects AC delay variations, as distinct from the DC effect of threshold voltage variation. The AC variability is likely due to the vertical resistance of the gate-stack. A comparison of two technol...

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Bibliographic Details
Published in:IEEE electron device letters 2019-01, Vol.40 (1), p.13
Main Authors: Jenkins, Keith A, Balakrishnan, Karthik, Lee, Dongsoo, Narayanan, Vijay
Format: Article
Language:English
Subjects:
CMOS
Delay
Threshold voltage
Variations
Online Access:Get full text
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Summary:The variability of CMOS device propagation delay is measured with a special test circuit. The circuit detects AC delay variations, as distinct from the DC effect of threshold voltage variation. The AC variability is likely due to the vertical resistance of the gate-stack. A comparison of two technologies, using gate-first and gate-last gate-stacks, shows much reduced variability of the gate-last FETs. This is attributed to the absence of interfacial dopant fluctuation and the presence of tailored metallic interfaces in gate-last technologies.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2018.2882268