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2 April 2010 Measurement and optimization of electrical process window
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Process window (PW) is a collection of values of process parameters that allow circuit to be printed and to operate under desired specifications. Conventional process window which is determined through geometrical fidelity, geometric process window (GPW), does not account for lithography effects on electrical metrics such as delay and power. In contrast to GPW, this paper introduces electrical process window (EPW) which accounts for electrical specifications. Process parameters are considered within EPW if the performance (delay and leakage power) of printed circuit is within desired specifications. Our experiment results show that the area of EPW is 1.5~6x larger than that of GPW. This implies that even if a layout falls outside geometric tolerance, the electrical performance of the circuit may satisfy desired specifications. In addition to process window evaluation, we show that EPW can be enlarged by 10% on average using gate length biasing and Vth push. We also propose approximate methods to evaluate EPW, which can be used in the absence of any design information. Our results show that the proposed approximation method can estimate more than 80% of the area of reference EPW.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tuck-Boon Chan, Abde Ali Kagalwalla, and Puneet Gupta "Measurement and optimization of electrical process window", Proc. SPIE 7641, Design for Manufacturability through Design-Process Integration IV, 76410J (2 April 2010);

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