Setting up the Simulation
Creating a New Configuration
First, change the source of the inverter to the pulse source used before. Set the parameters as follows:
Next, copy the inverter, and place the copy directly above or below the existing inverter. Ensure that the pulse source is connected to the inputs of both inverters. Add an output pin to the new inverter and name it "OUTPUT_LAY". Check and save the schematic.
Two windows will appear. In the New Configuration window, select Use Template...
In the Use Template window that appears, select "spectreS" in the "Name" field drop-down list. Select OK.
Back in the New Configuration window, change the "View" field from myview to schematic. Select OK.
The Cadence hierarchy editor will now appear as its default table format.
Select View -> Tree and the new Tree View will appear below.
There are two inverters listed. One of them is the new inverter that we copied from the existing inverter in the schematic view of invertersim. In this case, this inverter is I4. Right click on I4 and select Set Instance View -> analog_extracted.
Next, save these settings by selecting View -> Update and File -> Save. Close the Cadence hierarchy editor window.
Choose a 500ns transient analysis and select the input and two outputs to plot.
Run the simulation and you should then see the three plots. Seperate them using the Switch Axis Mode icon if you'd like. You can see that the extracted layout of the inverter is working correctly (as an inverter) and is slightly different than the other inverter. You can observe the differences by zooming in or using the calculator to measure the rise, fall, and delay times. For more information on using the calculator, see tutorial 2: Simulating an Inverter.