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Cmos inverter delay calculation using analytical model

Discussion in 'General Electronics Chat' started by ANALA, Sep 4, 2017.

  1. ANALA

    ANALA New Member

    Aug 14, 2017
    From alpha power law,analytical delay model for CMOS inverter is given by

    DELAY directly proportional to VDD/(VDD-VTh)^alpha

    Using this equation how do i calculate the delay for inverter and what should be the proportionality constant..i have extracted Vthn=0.6 ,Kn=0.0007 alphan=1.5, Kp=0.00049 Vthp=0.5 , alphap=1.1 from MATLAB curve fitting and VDD varies from 0.2V - 0.4V..I m using 16nm LP model file from ASU...output load capacitance is 1aF.. But since Vth is greater then VDD it returns complex values for delay..
    Last edited: Sep 4, 2017

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