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Selection of an amplifier

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monnoliv

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Hello,
I need a DC to 2GHz LNA with the lowest noise possible available.
I've selected the GALI-39+ from minicircuit, it's a DC-7GHz amplifier and it has a NF of 2.4 dB.
Since I'll use it between DC-and 2GHz (input blocking cap do the filtering), is it right that the NF will be lower than the 2.4dB on this BW? I've made some calculations and the ratio will be sqrt(2/7).
:?:
 


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    monnoliv

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Thanks VSWR,
By DC, I meant 50kHz that is next to DC :)
Thank you for the links. But in your low noise alternatives the lower frequency is 50MHz, is it possible to lower this down to 50kHz?
If not, is it possible to combine 2 amplifiers, the first for the 50kHz-50MHz BW and the second the LNA you mentioned?
The reason I took the "monolithic gain block" is their ability to go down to DC.
:?:
Regards,
 

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