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How to caculate input sensitivity?

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mastericke

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input sensitivity

When i read about input sensitivity in Section2.4 of RF microelctronics(RAZAVI),
i am confused about input sensitivity caculation.

If a SNR of 8dB in a bandwidth of 200kHz is required, and the total NF is 4dB, so how to caculate the input sensitivity is about -109dBm?
 

yubingz

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input sensitiv*

-174dBm+10*lg200000+8+4

noise floor, band width, SNR, NF
 

mastericke

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input sensitivity +4db and -10db

hi, yubingz
the result of the eqution that you give is -147dBm, not -109dBm.
This question is in th e first page of chapter6 in RF electronics(Razavi).
what's the problem?

thx!!!
 

VSWR

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what is input sensitivity

See below:
 

    mastericke

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yubingz

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input sensitivit

calculate it carefully
 

    mastericke

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