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    sharif.hasan
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    The general expression of voltage gain of transistor based amplifier:
    Av = −gm · RL

    Here, gm = dId/dVin = 2Id/(Vgs-Vth) and Vin = Vgs.

    Av[gm] = dId/dVin . RL | Vin = Vgs

    at a fixed Vgs = Vin and RL, the voltage gain is the functional of the drain current, Id.

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