In my opinion, a broadband LNA will amplify out of band noise in the receiver system.
Yes.is it similar to noise folding?
No.As long as that noise stays outside your receiver channel, you don't care.
That's a topic for system level design to find the appropriate gain and bandwidth for different stages.
let me put what pancho_hidebo said in a different way. receiver sensitivity is given by;
You all misunderstand.and u may not want to pick up that much noise from lna stage.
hi guys,
let me put what pancho_hidebo said in a different way. receiver sensitivity is given by;
Receiver Sensitivity=-174dBm+10 log(noise equivalent system BW)+F_sys (dB)+C/N ratio (dB)
10 log(noise equivalent system BW) is a noise bandwidth of a system. for broadband LNA and Mixer, the noise bandwidth will be a large number and it will degrade the receiver sensitivity. Am i right in this context?
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No.the noise BW of a brandband LNA/Mixer will be similar to noise bandwidth of a narrow band LNA/Mixer i think!
No.
Devices consituiting Mixer have wide band width.
Wrong.i humbly disagree.
you can have wide bandwidth but when you receive, you receive on a single frequency.
Noise bandwidth of a receiver system usually will be measured +/-10KHz from the receiving frequency.
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correct me if im wrong with more information/examples.
noise bandwidth does not reduce.is this folding noise is similar to noise bandwidth reduction which i have explained above?
noise bandwidth does not reduce.
Wrong.
You can not understand folding noise from devices constituting mixer.
If you have RF simulator, do noise contribution analysis.
If you have RF simulator, do noise contribution analysis.
I am builder of mixer circuits.
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