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NCERT Class XII Chapter
Semiconductor Electronics
Questions With Solutions

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Question : 9
Total: 19
For a CE-transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2 V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current, if the base resistance is 1 kΩ
Solution:  
Here RC = 2 kΩ = 2000 Ω,
RB = 1 kΩ = 1000 Ω, β = 100, V0 = 2 V
(i) Voltage gain,
V0
Vi
 =
βRC
RB
 or
2
Vi
 = 100 ×
2000
1000
∴ Input signal voltage, Vi = 0.01 V.
(ii) IB =
Vi
RB
 =
0.01V
1000Ω
 =
0.01V
1×103Ω
 = 1 × 10−5 A = 10 µ A
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