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How to change GBW in ADA4627-1 Spice macromodel ?

Question asked by ZeusKnight on Jun 16, 2016
Latest reply on Jun 28, 2016 by harryh

Hi everybody,

 

I am currently trying to build a photodiode transimpedance amplifier based on the ADA4627-1 opamp. The first result I have obtained on a prototype circuit are quite bad, as I get a lot of excess noise generated inside the circuit.

 

I think that the abnormal behavior of my circuit may come from the tolerance on the opamp GBW Product. The datasheet specify a GBWP of 19 MHz, with a minimum guaranteed value of 16 Mhz. As I have designed the circuit using the 19 MHz GBWP value, my hypothesis is that I have a real opamp that is slower, with a real GBWP between 16 MHz and 19 MHz.

 

Now I would like to test that in Spice by simply changing the value of the GBWP product of the ADA4627-1 macromodel. However, I have no idea about how to do that, and the ADA4627.cir file don't help me, since the GBWP parameter is not explicitly specified.

 

So, here is my question: how to change the GBW product of the ADA4627 macromodel ?

Thank you very much for any help.

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