CBSE Class 12 · 2018 · SemiconductorsShort Answer

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Draw the typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine
(a) the input resistance (

r_{i}

) and
(b) the current amplification factor (

β

Solution

Input characteristic: plot

I_{B}

versus

V_{B E}

at fixed

V_{C E}

; its reciprocal slope gives the input resistance

r_{i} = (\frac{Δ V _{B E}}{Δ I _{B}})_{V_{C E}} .

Output characteristics: plot

I_{C}

versus

V_{C E}

for several fixed

I_{B}

; at a fixed

V_{C E}

the change in

I_{C}

for a change in

I_{B}

gives

β = (\frac{Δ I _{C}}{Δ I _{B}})_{V_{C E}} .

r_{i} = (\frac{Δ V _{B E}}{Δ I _{B}})_{V_{C E}}, β = (\frac{Δ I _{C}}{Δ I _{B}})_{V_{C E}} .

CBSE Class 12 Board · 2018 · Subjective

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