create finite delay of PFD in simulink

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ieok

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I try to model finite delay (nonideality) of PFD in simulink. I use the delay transport element. But it gives me weird output waveform because it ramping up and dn (poor slew rate) instead of giving me delay that I set (I set to 20% of the period). The input of the delay transport is a ideal squarewave pulses.
Hope someone can advise me.
 

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