GATE Electronics and Communications (EC) 2018 Solved Paper

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Question : 23 of 65

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A discrete-time all-pass system has two of its poles at 0.25∠0° and 2∠30°. Which one of the following statement about the system is TRUE?

It has two more poles at 0.5∠30° and 4∠0°.
It is stable only when the impulse response is two-sided.
It has constant phase response over all frequencies.
It has constant phase response over the entire z-plane.

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