I have simulated the inverter using LTSPICE...I m using this tool for the first time...I want to
1. measure the inverter delay
2. plot delay vs supply voltage
May i know the procedure to perform these two steps..
As requested i have posted .asc file on which i m working on...its basically a simple inverter...i want to measure the delay and plot it against supply voltage for different values of VDD
Here a more thorough approach. Note that to realistically display the transit delay, you need to make the clock amplitude a function of Vdd. Furthermore, it is more realistic to drive the gates of the inverter under test with a signal that comes from another similar capacitively-loaded stage; not from an ideal voltage source with near-infinite rise/fall times.
I show how to use the cursors built-into the plot pane to display the delay from 50% on the red V(in) on the upper pane to the red V(out) on the lower pane.
The ultimate inverter delay measurement method is to build a ring-oscillator out of an odd number of inverters, typically 11 to 31 stages, and then just measure the frequency of oscillation.