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LMH5401: Output are not 180° out of phase with the other

Part Number: LMH5401

Hello Team!

I am using the LMH5401 to realize the single-ended to differential transformation. But, the outp and outn are not 180° out of phase with the other. And there are too many harmonics of the fundamental frequency(300M). Any reasons for this? The circuit design is also shown below.

Best Regards,

James