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Signals and systems electrical engineering miscellaneous

  1. Given Z-transform,
    X(z) =
    z² - 3z
    ,
    1
    < |z| < 2
    3z-12
    2

    The time signal x(t) will be
    1. -
      1
      u[n] - 2n+1 u[-n-1]
      2n
    2. -
      1
      u[n] - 2n+1 u[n+1]
      2n
    3. 1
      u[n] + 2n+1 u[n+1]
      2n
    4. 1
      u[n] - 2n-1 u[-n-1]
      2n
Correct Option: A

X(z) =
z² - 3z
=
1 - 3z-1
z² + 3z-11 + 3z-1 - z-1
22

=
2
=
1
, ROC :
1
< |z| < 2
1 + 2z-11 - 1z-12
2

⇒ x[n] = – 2(2)n u[– n – 1] – 1/2n u[n]



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