I downloaded the OPA172.LIB from TI, attached it to the OPAMP2 symbol. It runs transient analysis correctly but when I run AC analysis, it appears to not work correctly. I checked various places in the circuit, and even the negative terminal of the op-amp is incorrect with the AC analysis.
From another thread I downloaded an OPA170 model that was said to have simulated correctly and it does the exactly same thing. If I use one of the TI op-amps everything works OK.
I have not seen this before where the transient analysis works correctly but not the AC analysis. I am tweaking values in a MFB low pass filter and need the AC analysis to work.
Can anyone shed light on this?
Thanks
From another thread I downloaded an OPA170 model that was said to have simulated correctly and it does the exactly same thing. If I use one of the TI op-amps everything works OK.
I have not seen this before where the transient analysis works correctly but not the AC analysis. I am tweaking values in a MFB low pass filter and need the AC analysis to work.
Can anyone shed light on this?
Thanks