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A small signal voltage amplifier in common emitter configuration was working satisfactorily.Suddenly its emitter-bypass capacitor (CE) got disconnected. Its:
1. Voltage gain will decrease
2. Voltage gain will increase
3. Bandwidth will decreases
4. Bandwidth will increase
Which of these statements are correct?
  • a)
    1 and 4 only
  • b)
    2 and 3 only
  • c)
    3 and 4 only
  • d)
    1,2, 3 and 4
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A small signal voltage amplifier in common emitter configuration was w...
Explanation:

When the emitter-bypass capacitor (CE) of a small signal voltage amplifier in common emitter configuration gets disconnected, the following changes can be observed:

1. Voltage gain will increase:
The voltage gain of the amplifier is given by the formula Av = -Rc / re, where Rc is the collector resistor and re is the emitter resistance. When the CE capacitor is connected, it bypasses the emitter resistance, effectively reducing the value of re and increasing the voltage gain. When the capacitor gets disconnected, the value of re increases, decreasing the voltage gain.

2. Bandwidth will decrease:
The bandwidth of the amplifier is determined by the product of the gain and the frequency response of the amplifier. When the CE capacitor is connected, it provides a low impedance path to the AC signal, increasing the frequency response of the amplifier and widening its bandwidth. When the capacitor gets disconnected, the emitter resistance increases, reducing the frequency response of the amplifier, and narrowing its bandwidth.

Therefore, the correct answer is option 'B': 2 and 3 only. The voltage gain will increase, and the bandwidth will decrease when the CE capacitor of a small signal voltage amplifier in common emitter configuration gets disconnected.
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A small signal voltage amplifier in common emitter configuration was working satisfactorily.Suddenly its emitter-bypass capacitor (CE) got disconnected. Its:1. Voltage gain will decrease2. Voltage gain will increase3. Bandwidth will decreases4. Bandwidth will increaseWhich of these statements are correct?a)1 and 4 onlyb)2 and 3 onlyc)3 and 4 onlyd)1,2, 3 and 4Correct answer is option 'B'. Can you explain this answer?
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