Dear TUKA, [quote userid="544756" url="~/cadence_technology_forums/f/custom-ic-design/56682/behavioral-model-for-a-vga"]Now, in order to flatten the TIA response, I would like to cascade my TIA with a variable gain amplifier (VGA). [/quote] Please allow me to add a pedantic note to your request. A variable gain amplifier (VGA) is usually designed as a broadband amplifier without any intentional frequency compensation for prior stages or the response of a communications channel. If you are trying to equalize the response of the TIA, you might consider using some type of linear equalizer followed by a VGA. [quote userid="544756" url="~/cadence_technology_forums/f/custom-ic-design/56682/behavioral-model-for-a-vga"]I am interested in building a behavioral model for a VGA, just similar to a TIA using verilogA. My main focus is to flatten the TIA frequency response using the VGA response. [/quote] It is not clear to me what parameters you are trying to include in your model. Hence, I can only provide a reference that includes an example listing for a low-noise amplifier with options for its IP3 and noise figure at URL: https://designers-guide.org/modeling/modeling-rf-systems.pdf If you have already created your TIA model, from my simplistic understanding, it seems as if you can use it as a template for a compensating linear equalizer with the inverse frequency response. Shawn
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