Define amplification factor and drain resistance, Electrical Engineering

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Q. Define amplification factor, drain resistance and transconductance and derive the relationship between drain resistance and trans conductance?

Drain resistance

It is the ratio of change in drain-source voltage (?VDS) to the change in  drain current ?ID)  at constant gate-source voltage ie ac drain resistance rd = ΔVDS / ΔID at constant VGS.


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