Multiple choice

A low-pass filter having a frequency response H (j$\omega$) = A ($\omega$)$e^{j \phi (\omega)}$ does not produce any phase distortion if

  1. A($\omega$) = C$\omega$2, $\phi$($\omega$) = k$\omega$3
  2. A($\omega$) = C$\omega$2, $\phi$($\omega$) = k$\omega$
  3. A($\omega$) = C$\omega$2, $\phi$($\omega$) = k$\omega$2
  4. A($\omega$) = C$\omega$2, $\phi$($\omega$) = k$\omega$-1
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B Correct answer
Explanation

A LPE will not produce phase distortion if phase varies linearly with frequecy.

$\phi (\omega) \propto \omega \\ i.e \qquad \phi (\omega) = k \omega $

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