Help me with my phase of the output

[qutang]

how about the phase?

I design a linear regulator with ripple rejection. but I find the phase of the output is ahead of the input phase.
I just want to ask:
Is the miller capacitor is too large from the output of the erramp to it's input?

 

[simonkuo]

Re: how about the phase?

Do you ever run the closed loop stability simulation?

 

[cetc1525]

how about the phase?

I think your cap is too large.

 

[qutang]

how about the phase?

my phase is very stable.

 

[leo_o2]

Re: how about the phase?

Maybe you need to post your phase here to help analysis.

 

[xieyan2001]

Re: how about the phase?

Have you checked the phase margin of your regulator?

When you check phase margin, pls de-connect your capacitor.