Define amplification factor, Electrical Engineering

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Q. Define amplification factor?

Amplification factor μ

It is the ratio of the drain -source voltage (ΔVDS) to the change in the gate to source voltage (ΔV_GS) at constant drain current .
Amplification factor,μ ΔV_DS ΔV_GS at constant ID.

Ampilification factor of a JFET indicates how much more control the gate voltage has over drain current than has the drain voltage.
μ = ΔV_DS / ΔV_GS
multiplying the numerator and denominator on R.H.S by ΔI_D,
we get

μ = (ΔV_DS / ΔV_GS)*(ΔI_D / ΔI_D) = (ΔV_DS / ΔI_D) * (ΔI_D / Δ_GS)

μ = r_d * g_fs

amplification factor = ac drain resistance * transconductance

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