open-source-silicon.dev

Hi everyone while doing PEX I am getting this issue, I dig out and found out that issue is in cap #branch, for info I have two cap(240p,11p) one(11p) is working fine other one(240p) is individually PEX is clear I attached it in circuit consisting of PFD,VCO, loop filter, charge pump it is working but when I attach divider I get this error for cap. I removed this cap and put ideal cap circuit start working. What could be possible issue as described above I tested it in bulky circuit it is working but when I attach divider circuitry(schematic not layout)it stopped working. Further today I removed 240p and attached 11p_pex in parallel to make 240p still I get same error

I attached 11p in parallel to check how much it can run so upto 180p capacitance Xschem run but when I increase it more I get to timestep. One thing I noticed it that as circuit get bulkier Xschem tends to fail, there is no issue in PEX I guess, similar story is with my colleague they get same issue as mentioned in one above post by nouman Ahmed as circuit is getting bigger Xschem is creating issues.