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Queries about AD8375 OIP3 Measurement

Hi, there

I am testing the OIP3 of AD8375 and found the results can't be get as specifications in the datasheet.

When TC3-1 are applied at both input and output with the gain of 20dB, OIP3 is about 40dBm.

When TC3-1 is placed at input, while ETC1-1-13 at output; OIP3 is about 47dBm @ 70MHz, 42dBm @ 60MHz and 80MHz. The result can’t get the spec in its datasheet.

The power supply is 5.5V.

And schematic and PCB layout are attached for your reference.

Could you please help clarify some possible reasons for the results or give some comments?




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