Gain and noise calculation

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Giowizzy

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***Please break it down with more info as possible...Greatly appreciate.


Suppose a receiver consists of an low noise ampli er with a gain of 30 dB and noise gure of
2 dB, followed by a second stage of ampli cation of another 20 dB with a noise gure of 10
dB.
(a) What is the total noise gure and gain of the system?
(b) Suppose a 10 dB attenuator is placed at the input of the LNA. What is the resulting
overall gain and noise gure?
(c) What if the attenuator is placed at the output of the LNA?
 
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Re: Can you solve this problem?

From my understanding
a. Values in db add up so gain would be 50dB and noise gain of 12dB.
b. Attenuator would result in -10dB addition. So gain 40dB and noise gain 2dB.
c. Answer would be same as b
 

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Re: Can you solve this problem?

Dear Giowizzy,

the best advice is that you try to solve your assignments by yourself.
You risk to get wrong answers, like in post #2.
Regards

Z
 
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