AD831 vs AD8342 vs LTC5562 conversion phase

Hi,

I'm looking for a mixer that the conversion phase gap must be small between different RF input power.

For example, AD831 conversion phase gap between RF input -20dBm & -40dBm is about less than 0.1 degree, but AD8342 & LTC5562 are about more than 2 degree.

AD831's conversion phase is suit for our device system, but bandwidth is not enough.

What's difference between AD831 and the others? 

Can the other mixers' conversion phase gap between different RF input power be improved? 

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