Process Mismatch Analysis based on Reduced-Order Models


Yelten M. B. , Franzon P. D. , Steer M. B.

13th International Symposium on Quality Electronic Design (ISQED), Santa-Clara, Cuba, 19 - 21 March 2012, pp.648-655 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/isqed.2012.6187561
  • City: Santa-Clara
  • Country: Cuba
  • Page Numbers: pp.648-655

Abstract

This paper describes a methodology based on reduced-order models to investigate the effects of process mismatch in analog circuits in the presence of reliability degradation. Neural network-based reduced-order models for the DC drain current, I-ds, of 65 nm n- and p-channel transistors have been generated in terms of six process parameters, temperature, and device age. The models identify the contribution of process parameters to the mismatch of n- and p-channel transistors as they age. Hot carrier injection (HCI) is considered as the main reliability degradation for n-channel devices and negative bias temperature instability (NBTI) is considered for p-channel devices. It is demonstrated that the variations of the effective channel length and intrinsic threshold voltage are major contributors to device mismatch in the absence of aging. Finally, a beta multiplier current reference is analyzed using the developed models for the impact of process mismatch with and without the aging effects. It is shown that in a cascode current mirror the variability of the reference current can be reduced by ensuring that the same rail transistors experience similar variations.