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Spice simulation for quad OpAmp AD8513

d.shpigel

Hi
I want to use AD8513 with my circuit but first I want to simulate its behavior, My design software is Altium Designer, after spending time on it try trying to figure out why it doesn't behave correctly I realize I may not inserted correctly the Spice model of AD8513, I did try to open the model in LTspice and I think I figure my problem with it's. I think the cause of my problem is that the Spice model for the AD8513 works only for 1 OpAmp inside it, I got that conclusion because after adding that Spice file to LTspice it created only one OpAmp and not 4 as I was wanted.
If I'm correct, Whats are my options to simulate all the 4's OpAmps of this component?
thank you,

  • 0

    I know nothing of Spice within AD.  With that disclaimer in place ...

    For simulation, include 4 opamps of the same type in your schematic.  Forget about sections.  OR, create a model for each of your sections, reflecting the appropriate pins at the schematic symbol (1,2,3 for opamp 1,  5,6,7 for opamp 2,  third section for power and ground.)

    Simulation wise, your results are not going to change by section used for something like an opamp.  At very high frequencies, (RF, microwave, etc.) the sections could be different, reflecting different bond wire inductances, stray capacitance, etc.  If you have a quad part where the sections ARE different, i.e. perhaps one has input limiting or perhaps output inversion, or some other feature, then the sections should have their own models (from the mfgr).

    IF you want badly enough to have one package for the four sections, then create a Spice model for that quad package.  The model would need one reference submodel and the four sections would each call that submodel, with different pin numbers or other arguments.  If you do this correctly, you will not have any inadvertent connections between the four sections.