Learning analogue control theory

[Boscoe]

Hi all,

I can easily design circuits with basic control loops utilising op amps and I can create PID loops in digital systems however anything complicated in the analogue domain completely fools me. I'm talking about multiple loops and loops with many elements. I vaguely understand Routh arrays and other stability analysis methods. Does anything have any resources for learning this stuff from the ground up? I happy with anything such as books, youtube vids or online content but I'd prefer books.

Thanks!
Boscoe

[Dave]

Here's a nicely written book about control systems theory.
Brian Douglas, the author of the book, hosts a Youtube channel where he has lectures on the topic. The book actually came after the Youtube videos - it's basically a refined version of the information that was presented in the videos.

[tmadness]

I know that Design of analog CMOS integrated circuits by Behzad Razavi goes through control theory in a analog IC context for a few chapters.

[jonpaul]

DelToro & Parker

Principles of Control System Engineering  is the classic,  in CCNY 1960s.
https://www.amazon.com/Principles-Control-Systems-Engineering-McGraw-Hill/dp/B0000CKS38

Jon

[LaserSteve]

These are something I work on regularly. The scanner amp for a high speed galvanometer scanner.  The scanner has a led and two or four photodiodes in its base with a moving flag. This forms a photosensor that sources differential currents as A and B feedback inputs.  A closed loop current source linearizes the feedback sensor.  Once you know that, you have low frequency damping, high frequency damping, servo as proportional. The other feedback means is EMF from across the Galvo coil. This is for a Cambridge Technology 6850 amp. The new ones are often DSP based.  Capacitor and Resistor values change by model of galvanometer and its shaft inertia/resonances/ sensor gain.   The next step up adds a notch filter assembly, not shown.  An LM3886 is used as a power Op-amp.

Enjoy....

Steve

[LaserSteve]

Two more scanner amps, these are for galvos or pen motors that have a torsion rod  spring to return them to center.  Back EMF is then used to derive the feedback.
These are ancient, and designed by General Scanning Inc.  Note the R-L  bridge for damping derivation on the A-102.

Enjoy...

Steve