Electronics Tutorial - Building a Low noise signal amplifier Part 1/3 - Documentation

In this electronics tutorial mini-series I set out to build a low noise signal amplifier to measure very small signals that are usually below the generic oscilloscopes noise floor.
This time I look at the fundamental concepts behind measuring very small signals - where this is used and how a circuit needs to look like to achieve this. I have a look at multiple Application Notes to see what others have done and see what the essence of such a circuit is.

Application Notes:
https://www.analog.com/media/en/technical-documentation/application-notes/an124f.pdf
https://www.analog.com/media/en/technical-documentation/application-notes/an83f.pdf
https://www.analog.com/media/en/technical-documentation/application-notes/an159fa.pdf

Also in this miniseries:
Ep1: https://youtu.be/Xn9LNgVKdqI
Ep2: https://youtu.be/Car8hk_ubJs
Ep3: https://youtu.be/2mGKvGYwWrk

More info on the topic:
https://www.youtube.com/watch?v=Ta1ZuZTHYXA
https://www.youtube.com/watch?v=WxhjLIu-vPg&list=PLG8XCe9NZ_j8wCzxYk6ZmEJB7kULdLzPd&index=1

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Music:
The Builder by Kevin MacLeod http://incompetech.com
Creative Commons — Attribution 3.0 Unported — CC BY 3.0
Free Download / Stream: https://bit.ly/_the-builder
Music promoted by Audio Library https://youtu.be/nuEQC2TKWDo

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