Define with respect to FET:- (i) Static drain resistance (ii) Dynamic resistance (iii) Trans conductance (iv) Pinch-off voltage

Define with respect to FET:- (i) Static drain resistance (ii) Dynamic resistance (iii) Trans conductance (iv) Pinch-off voltage
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1 Answer

Answer :

(i) Static drain resistance- It is the ratio of drain source voltage (ΔVDS) to the drain current (ID) at constant gate-source voltage. It can be expressed as, Rd = (VDS)/(ID) at Constant VGS 

(ii) Dynamic resistance− It is the ratio of change in the drain source voltage (ΔVDS) to the change in drain current (ΔID) at constant gate-source voltage. It can be expressed as, Rd = (ΔVDS)/(ΔID) at Constant VGS 

(iii) Transconductance (gm) − It is the ratio of change in drain current (ΔID) to the change in gate source voltage (ΔVGS) at constant drain-source voltage. It can be expressed as, gfs = (ΔID)/(ΔVGS) at constant VDS 

(iv) Pinch –off voltage-The gate to source voltage at which the entire channel will be depleted of charge carrier and the value of drain current reaches its constant saturation value is called pinch off voltage.
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