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

[Richie Burnett]

Go for a servo control example... You compare where you want the output to be with where you are, produce an error signal and feed that back to reduce the error in the steady state. That's the example I used to teach to EE students. It also leads nicely on to all that PID control stuff too if you want to go there. 

-Richie,


Sent from my Xperia SP on O2

---- cheater cheater wrote ----

>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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