Which of the following is the inverse Z - transform of ๐ง๐งโ๐(โฃ๐งโฃ>๐)zโazโ (โฃzโฃ>a) ?a)๐โ๐a โn b)ac)๐๐a n d)1๐a1โ
Question
Which of the following is the inverse Z - transform of ๐ง๐งโ๐(โฃ๐งโฃ>๐)zโazโ (โฃzโฃ>a) ?a)๐โ๐a โn b)ac)๐๐a n d)1๐a1โ
Solution
The inverse Z-transform of ๐ง/(๐งโ๐) (for |๐ง|>๐) is ๐^n. So, the correct answer is c) ๐^n.
Here's a step-by-step explanation:
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The Z-transform pairs are defined as ๐ง^n โ ๐^n, where โ denotes a transform pair.
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The given function is ๐ง/(๐งโ๐), which can be rewritten as 1/(1-๐/๐ง) by dividing the numerator and denominator by ๐ง.
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This is now in the form of a geometric series, which has the sum 1/(1-x) = โx^n for |x|<1.
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Comparing this with the standard Z-transform pairs, we can see that the inverse Z-transform is ๐^n.
So, the correct answer is c) ๐^n.
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