Question

For an amplifier, midband gain = 100 and lower cut-off frequency is 1 kHz. Find the gain of the amplifier at frequency = 20 Hz.​

Answer 1

Answer:

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Answer 2

Given:

For an amplifier, midband gain = 100 and lower cut-off frequency is 1 kHz , and  frequency = 20 Hz.​

To Find:

Find the gain of the amplifier ?

Solution:

Here, amplifier have lower cut-off frequency is 1 kHz.

Therefore, we use below midband formula -

$A=\frac{A_{mid} }{\sqrt{1+\left(\frac{f1}{f}\right) ^{2} } }$

where, A= gain of the amplifier, $A_{mid}$= midband gain, f1=cut-off frequency

and f = frequency.

Therefore,

         $A= \frac{100}{\sqrt{1+\left(\frac{1000}{20}\right)^{2} } } \\ =\frac{100}{\sqrt{2501} } \\ =\frac{100}{50.0099} \\ =\frac{100}{50} \\ =2$

Hence , gain in the amplifier is 2 Hz.