Arrange the gain in the amplifier

Thread Starter

pooya_b

Joined Feb 25, 2021
53
hi

I want to know what is the effect of the order of gain on several amplifiers arranged in a row?
For example, the gain of the first amplifier is small, then the next amplifier has more gain.
Or vice versa.
 

Ian0

Joined Aug 7, 2020
3,281
Noise.
The second amplifier amplifies the signal and it also amplifies the noise of the first amplifier.
For lowest noise, the first amplifier should always be the quietest, and the one with the most gain
 

Thread Starter

pooya_b

Joined Feb 25, 2021
53
For what kind of application?
To convert the current to voltage, I used the first photodiode of a TIA amplifier, and then placed two other amplifiers in series so that I could increase the voltage and turn it on with an analog-to-digital converter.
 

DickCappels

Joined Aug 21, 2008
7,746
Usually once the transpedance amplifier brings the signal up to a workable level you can relax a little: unless following stages are pretty bad, your signal will be fine.
 
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