This 3 dB pad should influence LNA NF greatly, you can simulate the whole link budget and see the influence. You can use 3 stages, the 1st is low noise design, the 2nd is trade-off between noise and gain, the 3rd is OIP3 design.If you really do need 30dB then why not design for 13dB gain with the ATF-55143 and then follow it with a 3dB attenuator (and maybe a band limiting filter?)
This 3 dB pad should influence LNA NF greatly, you can simulate the whole link budget and see the influence. You can use 3 stages, the 1st is low noise design, the 2nd is trade-off between noise and gain, the 3rd is OIP3 design.
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