COMEDK · Physics · 30. Semiconductors
Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20 . If the input signal is \(0.01 \mathrm{~V}\), what is the output AC signal?
- A \(1.5 \mathrm{~V}\)
- B \(2 \mathrm{~V}\)
- C \(2.5 \mathrm{~V}\)
- D \(3.0 \mathrm{~V}\)
Answer & Solution
Correct Answer
(B) \(2 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
Voltage gain of first amplifier, \[ A_{1}=10 \] Voltage gain of second amplifier, \[ A_{2}=20 \] Input signal voltage, \[ V_{i}=0.01 \mathrm{~V} \] Total voltage gain, when two amplifiers are connected in series (cascaded), is given as \[ A=A_{1} A_{2}=10 \times 20=200 \] We…
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