5/10 work.

I measured the PLLY OLTF without inserting a notch filter for the PLLY control loop by high resolution (512 points per 100 kHz).

The results compared to the results of 8771 and 8434 (low resolution measured, without notch filter configuration) are shown in the first attached figure.

From this result, it was found that there is no part where the gain exceeds 0 db after UGF even in the PZT resonance part.

Further, the actuator efficiency of the PZT is measured in the same procedure as 8434 and 8378 with the notch filter inserted, and the results of comparison with the results of 8434 are shown in the second attached figure.

Here, it turned out that the result of 8434 differs from the correct value by a factor of 2 due to my mistake.

From this result, it was confirmed that the PZT resonance was canceled by the notch filter.