I'm running Cadence Virtuoso 6.1.6 through a remote desktop to computers at my school. These computers run Fedora 22. I'm simulating a ring oscillator VCO on Cadence, but it is taking literally FOREVER to complete the simulation. Here is the schematic of my VCO -
I have a vpulse generator which is attached to the feedback loop (as can be clearly seen in the above figure). I have a feeling that this pulse generator is the main source of the problem because the really slow simulations started after I added this component into my schematic.
Here are the parameters I have set for the pulse generator, just so you can get an idea -
I started simulation and it takes about 20 minutes to get to 12%. When I click the "Plot Outputs" button in ADE L, it shows that the simulation hasn't even started oscillating yet...and the estimated time of completion ranges from 1Hr16Min to 3Hrs+!
Has anyone else encountered this problem? If so, how can this be solved?
EDIT: I used the Ultrasim simulator on Cadence which simulates thousands of times faster than spectre, which was the simulator I was using before.