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 V , calcualte the output AC signal .
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Given:
Two amplifiers are connected one after the other in series (cascaded).
The first amplifier has a voltage gain of A1 = 10.
the second has a voltage gain of A2 = 20.
Input signal = 0.01V
To Find:
Ouptut of AC Signal
Solution:
When 2 amplifiers are connected in series,
- Output of first amplifier = A1xVi = 10x 0.01 = 0.1 V
- Output of second amplifier = A2 x Vi = 20 x 0.1 = 2V
Therefore output AC Signal = 2V.
Now we can infer that the,
- net gain = A1 x A2
- Therefore total gain = 10 x 20 = 200
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