EEVblog No Script, No Fear, All Opinion
A lot of texbooks don’t teach Composite Amplifiers, but they are one of the most used circuit configurations to solve real world design poblems where you have multiple conflicting specifications.
Opamp Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf
Cascaded Compound Amplifiers: https://www.youtube.com/watch?v=ZvT9hHG17tQ
Forum: https://www.eevblog.com/forum/blog/eevblog-1609-composite-amplifier-tutorial-practical-demo/
00:00 – Composite vs Compound Amplifiers
02:53 – How a Composite Amplifier works
05:09 – Why not just cascade them?
07:23 – This doesn’t just apply to opamps
08:24 – An example with gain, and another way to look at it
09:37 – Composite gain vs stage gain
11:19 – What’s the catch? + rule of thumb for stability
12:42 – Another example: Composite precision high bandwidth amplifier
14:50 – Breadboard demonstration of Composite vs Compound amplfiers
19:09 – Changing to Composite configuration and Magic Happens
20:07 – More magic as it compensates for the buffer drop too
Podcast (podcast2): Download
