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AD8349 input LO signal

I want to ask the input LO signal is best -6dBm , but I wonder is this -6dBm means the initial single-end -6dBm or each pin -6dBm of difference signals.

in the meanwhile, how the LO difference signals do into the AD8349 chip,first add two difference signals and then make them quadrature?Or else? please.

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