An N P N transistor is used in common emitter configuration as an amplifier with 1 k Ω load resistance. Signal voltage of 10 m V is applied across the base-emitter. This produces a 3 m A change in the collector current and 15 μ A change in the base current of the amplifier. The input resistance and voltage gain are:

Question

An N P N transistor is used in common emitter configuration as an amplifier with 1 k Ω load resistance. Signal voltage of 10 m V is applied across the base-emitter. This produces a 3 m A change in the collector current and 15 μ A change in the base current of the amplifier. The input resistance and voltage gain are:, 0.33 k Ω , 1.5, 0.67 k Ω , 300, 0.67 k Ω , 200, 0.33 k Ω , 300

MARKS App · Accepted Answer

l o a d r e s i s t a c e = o u t p u t r e s i s t a c e R L = 1 k Ω = 1000 Ω i n p u t v o l t a g e = Δ V i = 10 m V = 10 × 10 - 3 V i n p u t c u r r e n t = b a s e c u r r e n t = Δ i B = 15 μ A = 15 × 10 - 6 A o u t p u t c u r r e n t = c o l l e c t o r c u r r e n t = Δ i C = 3 m A = 3 × 10 - 3 A Δ i B R i = Δ V i = 0.67 k Ω R i = 10 × 10 - 3 15 × 10 - 6 = 0.67 k Ω Voltage gain = Δ I C R L Δ V i = 3 × 10 - 3 × 1000 10 × 10 - 3 = 300

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