When the PD of input port is shading，ADL5304’s output vibrate ，why ？For example video。
It looks like the ADL5304 is settling when going from shaded (PD is off) to when the light is impinging on the PD. It takes some time for the input measurement transistor and the FET amp to settle as they are in a loop, especially when starting without or very minimal input current.
Moved this question to RF and Microwave community. jdobler will be able to assist you better.
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