accuracy problem in simulating discrete/continuous mixed model in simulink

hi all,

i'm haveing an issue regarding the setting to simulate a
discrete/continuous mixed model (continuous time delta sigma modulator)
in simulink, particularly when i introduce excess loop delay (in
continuous time) in the feedback.

when i use different types of solvers, different max step size and
different loop delays, the results are significant different from each
other.

please help. if you have encountered any similar problem, i can give a
more specific description of this issue.

thanks in advance!

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