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I want to build spice models of high speed transimpedance amplifier. There are many? op amps in LTspice simulation. However, I am looking for very high speed TIAs from other manufacturers. They have many but unfortunately there is no spice model. In that case, is it possible to make a spice model of the TIA from the scratch if they provide their datasheets?

Thank you very much.

You asked about making a TIA model from scratch - but did you know that LTspice has some TIAs already?

Also, are you certain that the other manufacturers do not have SPICE models?? Some manufacturers make it challenging to find models when they are there.? Navigating websites has become challenging, IMO.

It is possible to make a generic TIA model, but probably not easy to make one that mimics characteristics of an actual part.? The answer depends on how closely you need the model to approach the actual part.? A generic model would lack things like nonlinear behavior.? Datasheets might not tell you enough about that.? But that's just my opinion.

Andy

If I search the group's Files for "TIA", several things come up, not all of which are for TIAs.? And that doesn't include transimpedance amps that don't use the "TIA" abbreviation.

If you have a particular TIA model in mind, search our group for the model name to see if anyone else has used it already.

Andy

Yeah I know that LTspice has several op amps. Probably all are from Analog Devices, right?
I contacted some manufacturers and they replied that they do not have SPICE models.

Thank you very much.

(OPA170 PSpice lib file).

Oddly, some of (what are now) Analog Device's TIAs do not seem to show up within their TIA section of the product selection pages, making their product selections incomplete.

I might be wrong, but it appears that ADI has rearranged their product selection pages and made them more difficult to navigate, as well as incomplete and maybe wrong.? Arrgh!

Andy

marcel wrote, " (OPA170 PSpice lib file)."

Of course that is an ordinary op-amp, not a transimpedance amp.

Most op-amps with feedback turn into transimpedance amps, so you might say that every op-amp can also be a transimpedance amplifier.

Mirza, I'm assuming that you want an actual purpose-built transimpedance amplifier, one that has everything in it already.? Right?? They are considerably less common than ordinary op-amps, of course.? I wonder what characteristics other than "very high speed" that your TIA needs.

Andy

On Tue, May 21, 2024 at 09:49 PM, Andy I wrote:

Mirza, I'm assuming that you want an actual purpose-built transimpedance amplifier, one that has everything in it already.? Right?? They are considerably less common than ordinary op-amps, of course.? I wonder what characteristics other than "very high speed" that your TIA needs.

Yeah I want an actual purpose-built transimpedance amplifier like OPA855 from Texas Instruments, LTC6268-10 from Analog Devices. However, these can not meet my bandwidth requirements for gate mode circuit (in my case). Thus, I am looking for spice models from other companies, however, they do not have (or provide) spice model for their high speed TIA.

According to your comments "It is possible to make a generic TIA model, but probably not easy to make one that mimics characteristics of an actual part. ?The answer depends on how closely you need the model to approach the actual part. ?A generic model would lack things like nonlinear behavior. ?Datasheets might not tell you enough about that. ?But that's just my opinion."
Yeah I feel that you are right.

On Tue, May 21, 2024 at 03:23 PM, Mirza wrote:

OPA855

* OPA855 - Rev. A
* Created by Sean Cashin; 2020-06-04
* Created with Green-Williams-Lis Current Sense Amp Macro-model Architecture
* Copyright 2020 by Texas Instruments Corporation

OPA855

* OPA855 - Rev. A
* Created by Sean Cashin; 2020-06-04
* Created with Green-Williams-Lis Current Sense Amp Macro-model Architecture
* Copyright 2020 by Texas Instruments Corporation

OPA855 does not meet the bandwidth requirement as I mentioned.
But thank you very much for your support.