**Part Number:**OPA209

Hi team，

- In the datasheet of OPA209, the frequency response curve shows that the phase shift of fc is about 80 degrees. But in the parameter table, there is a column that says that the phase margin is also about 80 degrees.
- According to my understanding, the phase margin should be equal to 180 degrees minus the phase shift of fc. Why is the phase margin directly equal to the phase shift of fc in the datasheet of OPA209?

Best Regards

Wesley Huang