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NCERT Class XII Chapter
Semiconductor Electronics
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Question : 10 of 19
Marks: +1, -0
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 volt, calculate the output ac signal .
Solution:  
Total voltage gain can be calculated as
AvA_v = AV1×Av2A_{V_1} \times A_{v_2} = 10 × 20 = 200
So, output voltage,
AvA_v = VoutputVinput\frac{V_{output}}{V_{input}} or 200 = Vout0.01\frac{V_{out}}{0.01} or VoutV_{out} = 2 V
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