Q. If the voltage gain of an amplifier is 100, then the gain in decibel is
Solution:
- Gain is a measure of how much an amplifier ‘amplifies’ the input signal.
- If we have an input signal of 1 volt and an output signal of 50 volt, the gain of amplifier is 50.
- The voltage gain in decibals is equal to 20 times the common logarithm of the ratio of output voltage to input voltage.
- Now we have this ratio as 100. so, gain in decibals is:
20 log(100) = 40dB
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