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AD8351 single-end input BW

Hi

I'm  prototyping with a single-ended circuit configuration (Datasheet P 14 Fig. 41) using the evaluation board of the AD8351.
Although a differential output is measured by inputting a 1Vpp sinusoidal wave (50 kHz to 200 MHz), the amplitudes of Hi and Lo are different.
And the gain setting is used at about 6dB, the OPHI gain lowers around 100MHz.

I want to flatten gain up to about 200MHz.

Thank you.