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Lvw, thanks again. I may just wrap up this discussion since I start to believe my circuit conundrum may be due to other unexpected events rather than oscillation. As for your useful comments, unfortunately, I still don't grasp the essential advantages of Middlebrook's method. In the last...
Thank you, LvW. I am confused now. I only know a smattering of Middlebrook's method. But I thought it is just to do AC analysis without breaking the feedback path. However, in Cadence Spectre, I can use a special Cadence element and it will connect the feedback path in DC and automatically...
Thank you, SunnySkyguy. I guess if I just plot the magnitude of current through the interested source or drain nodes of transistors, PM criterion should work. Sinewave of current delayed by 180 deg. with current gain equal to 1 should augment itself and oscillate. I can try it to check if...
Is there any trick in AC analysis to find the phase margin if the input stimulus is AC current instead of the AC voltage. If the input is AC current, the magnitude response is impedance rather than the intuitive voltage ratio. It seems like the PM in stability criterion does not apply any more...
If I need to use two different model files, one for -195C and one for 25C. How to switch the model file path, pathname, in path( pathname) when I use paramAnalysis("temp" ?values '(-195 25) )?
I am thinking for the workstation upgrade in the near future and we may purchase top-chip mixed-signal simulator, e.g., UltraSim. I am not sure our current server for 3 designers (eight 2GHz CPU cores, 32GB ram and 1.4TB SCSI disk) is good enough or not. Can anyone who has the experience of...
Thank you. erikl.
After scouring Cadence's Skill codes, I finally was able to use Skill code to place the used layers' name-purpose pair in both CIW window and in a text file. It is actually useful for examining the third-party cell, e.g., MIM cell from foundry, without missing any layer at...
Does anyone know how to use Skill code to show the layers used in the current Cadence layout window? That is, only for the layers shown on the current Virtuoso layout window.
Thanks.
Thanks, erikl.
Your suggestion works like a charm. It solves the problem that dogged me in the last few years. I modified my .cdsinit file and basically changed from hiSetBindKey("Layout" ---) to hiSetBindKey("Schematics" ---) for Viewall() command. Now, even I only view a few layers in the...
Whenever I did not have Viewall() in the Cadence Virtuoso layout editor, I could not see the note text in Cadence Composer schematic editor. Every time it happened, I had to open the layout editor, hit the Viewall() command, then, went back to schematic editor to see all the note texts. Is...
I finally figured out how to solve this problem. My solution is posted in the other forum:
https://communities.mentor.com/mgcx/message/11724;jsessionid=6EBAEC9564C0CB71449A520F6C64EE01
I need to use Calibre to LVS a schematic which has two symbols. One symbol is Cadence schematic view and the other symbol is CDL netlist. CDLIN is not working since this CDL netlist has cell with more than 10k I/O pins. No matter how I tried, this CDL netlist view cannot be recognized by...
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