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..

 

Please post your .asc file.

 

Please post your .asc file.

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

 

See attached.

 

A better circuit is to have your ideal source drive one of your inverters, have that inverter drive the inverter you are testing, and have the test inverter drive some number of other inverters (whatever fanout you want to spec your delay measurments at).

By driving your test inverter directly with an ideal supply, you have potentially unrealistic rise-fall times and drive currents driving your device, which can give misleading results. By having it drive other identical inverters, you know you have a realistic load instead of a load that you may not have any concrete basis for.