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S-parameter vs. Transient simulation in ADS

Question asked by kmz797 on Sep 11, 2015
Hi all,

I have designed a circuit in ADS. Where S-parameters simulation, the output signal will be delayed to input (Phase response of S21 is negative). If I simulate in Transient, output phase will lead to input. My design works at 1.5GHz. What should I trust? Please explain to me. Thank you so much.  

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