[sdiy] How to explain how negative feedback lowers noise?

Mike Bryant mbryant at futurehorizons.com
Mon Mar 22 19:02:04 CET 2021


Negative feedback only reduces the noise level by the amount NF reduces the gain of the system by.  The signal to noise ratio remains the same (to a first approximation).   

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of cheater cheater
Sent: 22 March 2021 17:41
To: synth-diy
Subject: [sdiy] How to explain how negative feedback lowers noise?

Hi all,
I'm trying to explain to people at my company (none of whom are EEs or
statisticians) how negative feedback works in a system. That's one thing that I'm trying to get across, and I can't come up with an explanation of it in every day terms. All the examples I find in biology etc seem kind of dubious and not very straightforward - there's a lot of "trust me on this" as to why it's actually negative feedback and not some form of other regulation. What's a simple /physical/ negative feedback?

The other thing I'm struggling with is why negative feedback lowers noise in an amplifier. That's actually an effect that's relevant to the work we're doing (it's some maths code stuff) and I just don't know how to explain it. What's the best way you can explain how this works?

Thanks
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