Source Stepping Failed - OPA2991 Sim

As @EL34 comment, Mike made some improvement to Qspice in handling TI non-physical opamp pspice model, which consist of many lookup table and switches.

After update Qspice to latest version, please add one of these .option
.options gshunt=1e-12
.options gmin=1e-11

I verified this with OPA2991 and TLV9352 from TI library, with Vee set to 0V.

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