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What is the roll-off rate of voltage gain vs frequency of a second order low pass filter?

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VSSC ISRO Technical Assistant Electronics 14 July 2021 Official Paper
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  1. -6dB/octave
  2. -12dB/octave
  3. -6dB/decade
  4. -12dB/decade

Answer (Detailed Solution Below)

Option 2 : -12dB/octave
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Detailed Solution

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The frequency response of the second-order low pass filter is identical to that of the first-order type except that the stop band roll-off will be twice the first-order filters at 40 dB/decade (12 dB/octave). 

The response of the second order filter is:

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