Numerical- Amplifier's gain for given ½ power frequencies & midband gain

Q.  What should be the gain of an amplifier at 20 kHz if the half power frequencies are fL = 20 Hz and fH = 15 kHz along with mid band gain = 80?
- Published on 23 Sep 15

a. 28.28
b. 48.07
c. 62.47
d. 78.77

ANSWER: 48.07

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    Discussion

  • Satyawati   -Posted on 29 Sep 15
    fL = 20 Hz
    fH = 15 kHz
    Av (mid) = 80

    To determine: Voltage gain at 20 kHz
    Formula : Av = Av (mid) / √1 + (f/fH)2

    Method of evaluation:
    To determine the voltage gain at 20 kHz, we know that,

    Av = Av (mid) / √1 + (f/fH)2
    = 80 / √1 + (20 k/15k)2
    = 48

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