phase is not smooth on the bode plot of closed loop flyback converter

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myil

Joined May 2, 2020
142
Hi,
I am trying to get a bode plot of closed loop flyback converter. But the phase of the bode plot seems to be nonlinear or at least not as expected.
I tried to look at the signals on the scope that there is a switching noise up to 1vpp at 100khz. Is it the reason why my phase is not smooth.
Can anybody help me how to get a smooth bode plot? I thought to add a inductor to the output of the converter but i guess it will change the transfer function of the converter. any suggestions?
 

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