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OrCAD simulation - Propagation delay of CMOS inverter

newUsername

I need to get the characteristics of dynamic parameters of CMOS inverter (tplh,tphl,tp) and measure them from the graph.

Inverter is induced by square pulse generator with frequency 200kHz and fill factor of 20%.

Inverter is loaded with capacitance 100pF.

Questions:


I have drawn the schematics, but don't know how to set parameters of VPULSE generator properly (I set V1=0, V2=5, PW=0.2, PER=0.000005).

Also, how to set simulation profile?

In DC sweep, I set voltage source V3 as a sweep variable and also include time domain (transient).

How to get UDD=f(t) characteristics and measure dynamic parameters of CMOS inverter?

 

  • newUsername
    Note: I am using Orcad Cature CIS Lite 16.6. version.
  • oldmouldy
    PW would be the Pulse Width and PER would be the Period, for repetition, so your numbers are a bit off. For a VPULSE, you also need to account for Delay, TD (can be 0), before the first "switch", Rise, TR and Fall, TF. You can also use the regular multipliers for values. V1 and V2 are OK, start with a PER of 5u and get PW, TR and TF within that value. TR and TF will need to be reasonably fast to get a measurement from your inverter but cannot be 0 and very small values may cause the circuit to not converge. See the pspcref.pdf in the doc\pspcref folder in the installation for the parametric reference, Independent Current and Voltage sources.
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