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Cadence Tip: Use the lib function to eliminate the settings of the new ADE
The main issue I face is that I often need to run multiple simulations on the same circuit. For example, with a bandgap circuit, I might run DC analysis, loop gain, and sometimes even add a chopper and run a transient simulation. This creates a challenge: I have to create many ADE states (since my company uses an ocean-like GUI, each simulation—like PVT variation or Monte Carlo—requires its own ADE state).
To save time, a colleague showed me a trick to avoid setting up a new ADE for each simulation. Here’s how it works:
1. First, I start with a basic simulation setup.
2. Then, I create a file that defines different simulation conditions.
3. I add this file to my library.
4. Finally, I select the required condition and run the simulations.
As you can see, even though the simulation length is set to 20ns in the interface, the output waveform shows 30ns because I selected a 30ns setting from the LIB. Don’t forget to disable the original check in ADE.
This method allows me to run various conditions within the same ADE session by selecting the appropriate library file. You can also create a file to control the library settings. Some users prefer running simulations via commands instead of using the GUI.
I tried nesting the "lib" function by including a model file inside my library file, and it worked perfectly. I modified some parameters like "Fast" and "Title," and the results changed accordingly.
This approach lets me create one file that covers all the conditions I want to test. If you're interested, there's a guide on how to save DC operating point parameters in Cadence MOSFETs. It explains how to save parameters like Vth and gm, which are useful when working on bandgap circuits to extract values like beta and Nf.
To do this, set up a simple circuit, note the transistor instance name, open a text file, and save the relevant parameters. Then, load the file into the simulator and run a DC analysis. The results will show the transistor’s operating point, allowing you to extract key parameters.
This technique not only saves time but also improves consistency across different simulations. It's especially helpful when dealing with complex designs that require multiple variations. Give it a try and see how it streamlines your workflow!