Hi,
Since today I have a strange behaviour in the ADE Explorer. I perform different simulations in order to get some specifications for a fully differential opamp which I designed. All these simulations worked fine until today.
I changed something in the schematic of the opamp and since then the noise simulation is wrong when I simulate only one corner or perform a Monte Carlo simulation. If I simulate multiple corners the noise simulations calculates a correct result.
EG. I simulate for example the Nominal Corner, the noise simulation gives me a result of around 50uV/sqrt(Hz) (at a frequency of 200kHz) (way too much).
If i simulate the nomial corner and for example a corner with a different ambient temperature, the reported noise is around 10nV/sqrt(hz) (in the range of the expected value).
If I then open a debug environment and simulate the noise there it is again around 50uV/sqrt(Hz) (for the nominal corner and also for the other corners).
I tried to revert my opamp schematic to the point where it worked but the strange behaviour stays.
Do you have any ideas what is happening here and how to resolve this issue?
Kind regards
Lukas