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Question about noise figure change after Rin lowered for an ADC

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ruwan2

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Hi,

I read noise figure calculation from Maxim AN. For ADC NF calculation, it says:


.........
3. As RIN is lowered, the full-scale power level increases, thereby increasing the effective noise figure for a constant SNR.

The link of the above statement is from here:

https://www.maximintegrated.com/en/app-notes/index.mvp/id/1197

It is contrary to my first guessing. Could you explain it to me?

Thanks,
 

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