Just curious... do any of those of you doing amplifier/filter/power supply/etc. design sit down and use R. D. Middlebrook's Extra Element Theorem (EET) or the extended N-extra element theorem (NEET) to come up with "low entropy" (his term) analytical functions for your designs? The idea is that you can pretty quickly come up with equations that directly imply pole/zero locations, frequency dependence, etc., something that -- even for relatively simply circuits -- becomes quite "messy" if you just use standard node voltage and/or current loop equations.
I'm curious how much the EET is a useful tool that I just missed out on in college (my college had a memorial plaque to the guy who figured out how to measure the water content in cow's milk to insure it hadn't been diluted by unscrupulous farmers, I kid you not...) vs. being a pet project of a select few with limited real-world applicability; on the surface it appears pretty cool.
---Joel Kolstad