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how to set W/L for the transistors in the given OTA

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ankitasinha

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what transistors to use in orcad for the given OTA

ota.jpg

i am working in oracd and i have to make this schematic. so which MOSFETS should i use for this and do i really need to set its W/l or orcad capture will automatically set it?
also
how to check in simulation window , if its working properly?
how to lot its "gm" curve


plz help
thanx
 
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You need to set this manually. Try placing mosfet from breakout library and Do edit model from schematic and define various model parameter. I guess you are new to simulation and modeling so first you need to out about this a bit more. You may want to try reading and doing exercises from "Learning PSpice". You can access this from OrCAD Capture Help menu, this comes with host of design example with explanations.
 

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