The "right" IF amp amplification factor

[BarNash]

Hi all

What is the "RIGHT" amplification factor of the IF amp in a receiver?

I understand that bandwith is opposite relational to VO/VIN , lowering two much will denote a too weak signal applied to the detector.
So where is the right point on the amplification factor of the IF amp ?
Thanks
Elico

 

[jiripolivka]

Hi all

What is the "RIGHT" amplification factor of the IF amp in a receiver?

I understand that bandwith is opposite relational to VO/VIN , lowering two much will denote a too weak signal applied to the detector.
So where is the right point on the amplification factor of the IF amp ?
Thanks
Elico

What is your receiver for? What is the signal modulation? Frequency, bandwidth, noise figure?

There are any IF amplifier versions, different for different purposes.

 

[chuckey]

" bandwith is opposite relational to VO/VIN ". If you consider a series of transistor stages which are transformer coupled, this is the configuration with the highest gain AND bandwidth. Now if you want to reduce the bandwidth you have to put in filters which must have some losses. So as the bandwidth reduces so does the gain, so extra stages are required.
Frank

 

[BarNash]

So what is the "best" or "right " Vo/Vin ratio for the IF amp that the designer should aim to ?

Elico

 

[volker@muehlhaus]

So what is the "best" or "right " Vo/Vin ratio for the IF amp that the designer should aim to ?

You need to think about your entire receiver chain, levels and cascaded noise figure. Designers usually do system level calculations. Some build Excel sheets, other use system level simulation tools.

**broken link removed**

https://de.mathworks.com/help/simrf...iver-on-communication-system-performance.html

 

[jiripolivka]

You still fail to explain the purpose of your IF amplifier. HOw can one advise you not knowing the parameters important to you?

 

[BarNash]

My question is general, the answer/s will give me the ability to chose the right amplification according to
all relevant parameters that apply .

Thanks
Elico

 

[vfone]

The amplification should be high enough to make the receiver system to meet the specified SNR (signal-to-noise ratio).
For better understanding read RF system design papers, some of them posted above.

 

[BarNash]

I see
Thanks
Elico