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I'm starting to design my amplifier with Mesfet.I calculated my stable amplifier with scattering parameters,however I don't know how do dc bias because I don't have any dc equations for Mesfet and and I can't extract dc information from datasheet (because datasheets only define IDSS (without threshold voltage such as FETs equation) and Vp (without define K coefficient such as Mosfet's equation).