Explain the terms rd and gm.

1.	Explain the terms rd and gm.
Answer» (i) Ac drain resistance (r_d) is the ratio of small change in drain to source voltage V_DS to the corresponding change in drain current (I_D) for a constant V_GS. (ii) Transconductance (g_m) is the ratio of change in drain current I_D to the corresponding change in gate to source voltage V_GS for a constant V_DS.

Answer»

(i) Ac drain resistance (r_d) is the ratio of small change in drain to source voltage V_DS to the corresponding change in drain current (I_D) for a constant V_GS.

(ii) Transconductance (g_m) is the ratio of change in drain current I_D to the corresponding change in gate to source voltage V_GS for a constant V_DS.

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Explain the terms rd and gm.

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