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There are multiple problems with that line, pointing to a few mistakes. The pin-order is all messed up.? It seems to have connected the input pins to net N002 and ground, the power pins to nets N003

It appears that the symbol is able to call the OPA891 spice model without problem. I edited the model to make the pins agree with the conventional symbols, but it won't run I used the TI model

That is not new to Version 24.? I think it has been such ever since LTspice IV.? People who ignored the advice and tried adding their models in the wrong place, sometimes found that it did not

That has been the advice from here for many years prior to V24.

It's unwise to store your stuff in the LTspice 'working copies' of the native folders, that also? should never be touched. This is because your 'LTspice' becomes different from those of everyone

Since Version 24 came it appears that I am supposed to keep my user defined models in a different place than the factory models, However I have not yet made the switch from the file structure I had

Very good advice. You can also, with advantage, do both; save in both locations, so that in 2027 you won't need to recall which? schematic directory the model is in. -- This email has been checked

Just in case it was not obvious already - Use LTspice's "opamp2" symbol with this model, after making the change to the model file. Change the name next to the symbol from "opamp2" to "OPA891". Also

Let us know if you encounter any problems with that model.? I did not try it yet. Andy

It is a SPICE model. TINA-TI can use either generic SPICE models, or models using their own format which only work in their program.? Fortunately, this one is a SPICE model.? ?In that respect,

TI is publishing the OPA891 model only for their TINA program. I understand there is a procedure to extract the TINA model information and make a LTSpice-compatible model. I also understand that the

I suppose that Rds depends on die temperature, too, so large signal Rds is a thicket, not a value. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Even in the FET's linear region, it is nonlinear.? It is unlikely that a JFET or MOSFET has an Rds that is actually linear, in the so-called linear region.? It "bends", even there. But if you found

Either one.? They would be the same.? (But unlikely.) Andy

What will be the expression for RON then?

Not necessarily. If it is linear, then you know that the small-signal and large-signal definitions would be the same, so there would be no question. Andy

But RON is defined for linear region right?

It's impossible to say anything about your files or models, without seeing them. But I will say that you probably can separate the photodiode part of the model from the amplifier part of the model.?

Anything is possible if you know what you are doing. Why not post your files by uploading them to the \Temp folder. That way we are in a better position to help you. Best method is to combine the into

Hi I got a .CKT file and .lib file of photodiode and transimpedance amplifier. I know how to make spice model from these files. However, I want to separate transimpedance amplifier part from the .CKT