Delay and Power Expressions for a CMOS Inverter Drivinga Resistive-Capacitive Load

  • Authors:
  • Victor Adler;Eby G. Friedman

  • Affiliations:
  • Department of Electrical Engineering, University of Rochester, Rochester, NY 14627;Department of Electrical Engineering, University of Rochester, Rochester, NY 14627

  • Venue:
  • Analog Integrated Circuits and Signal Processing - Special issue: analog design issues in digital VSLI circuits and systems
  • Year:
  • 1997

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Abstract

A delay and power model of a CMOS inverter driving aresistive-capacitive load is presented. The model is derivedfrom Sakurai‘s alpha-power law and exhibits good accuracy. Themodel can be used to design and analyze those CMOS invertersthat drive a large RC load when considering bothspeed and power. Expressions are provided for estimating thepropagation delay and transition time which exhibit less than27% discrepancy from SPICE for a wide variety of RCloads. Expressions are also provided for modeling the short-circuitpower dissipation of a CMOS inverter driving a resistive-capacitiveinterconnect line which are accurate to within 15% of SPICEfor most practical loads.