This document provides instructions for performing mismatch and process analysis in Cadence using Monte Carlo simulation. It outlines the steps to: 1) Define output variables to monitor, such as voltage offset (Voff) between input and output. 2) Run a Monte Carlo mismatch simulation using mismatch transistors from the library, specifying the number of simulations. 3) Check the results table and status to analyze mismatch effects. 4) Change transistors from typical (tt) to Monte Carlo (mc) models to analyze process variations. 5) Run a Monte Carlo process simulation similarly and check the results.

1. "In the name of God"
Monte Carlo Simulation
(Mismatch and Process)
In Cadence
A work by Saba Bolurifar
Thanks to Dr. Masoud Meghdadi
and Mr. Dariush Naseh
Shahid Beheshti University of Tehran
2020

2. Mismatch Analysis
To do mismatch analysis for all of the transistors of a circuit:
1. Use mismatch transistors from the library of tsmc18rf for example: pmos2v_mis.
2. At ADE L define the Outputs that you want to get the result. For example in Figure1.
Voff =Vout-Vin has been defined and has been added to the Outputs.
Figure1.
Figure2.Voff

3. Figure3.Voff=Vout-Vin
3. Do the following steps below:
1. From Launch menu open ADE XL
Figure4.
2. Choose "Create New View" and then click "OK"
Figure5.

4. 3. Click "OK"
Figure6.
4.
Figure7.

5. 5. First, choose "Monte Carlo Sampling" and then Click "Simulation Options"(Number 2 in
blue)
Figure8.
6. Choose "Mismatch" and then enter the number of simulations
Figure9.
1
2
1
2

6. 7. Choose "Run Simulation" as it is shown bellow
Figure 10.
8. You can get the data that you need in the Results tab. In order to check the process, you
can check the "Status" part (in blue).
Figure11.

7. Process Analysis
1. As we want to see the effect of process on our results, we need to change our transistors from
"tt" to "mc" (mc stands for Monte Carlo).
1.1. Double click on "Tests"
1.2. Double click on the name of your library (here is "OPAMP_2020")
Figure12.
1.3.In the new window choose "Setup", "Model Libraries"
Figure 13.
1.1
1.2

8. 1.4.Change "tt" to "mc"
Figure14.
Figure15.
1.5.Save your state in Cellview as shown below:
Figure16."Session","Save Sate…"

9. Figure17.Choose "Cellview" and then click "OK"
2. Do the steps 1 to 5 of "Mismatch Analysis"(Figure2. to Figure8.)

10. 3. Choose "Process" and enter the number of simulations then click "OK"
Figure18.
4. Do the steps 7 and 8 of "Mismatch Analysis"(Figure10. and Figure11.)