LTM4638 Noise

Hi:

I want to ask a question about LTM4638.

when I use LTM4638,my vin is 12V, Vout is 0.95V ,but I mesured much high frequency noise( about 280MHz) with the frequencyspectrograph,and this noise has influenced my 12V  power plane,so what can i do ?

thanks!

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