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Now a customer uses the reference design figure 3 in the datasheet, and the bias supply is -40V for the APD, the APD input capacitance is about 2.5pF. Compared to DC input and AC output, when used as AC input and AC output, the output noise will increase. Is it reasonable for this case. I want to know the root cause.

If AC input and AC output is required, do you have any suggestions to decrease the output noise?