Simulink help: phase delay 90 degree

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peter_hawk

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phase delay simulink

Dear all:

I want to do the image rejection receiver using Simulink.
But I can not do the "90 degree phase shift" in Simulink.
Any one have good suggestions?
Thanks!
 

simulink phase shift

I have resolved this problem.
I use a all-pass filter to make a 90 degree phase shift.
 

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