Re: Interesting negative capacitance circuit

It's not. It makes a whole lot of fundamental work accessible, which makes it extremely handy for people with merely adequate mathematical skills, but it's more of a cook book than an exposition of the theory.

Seems it'd be easier to use the 200V amplifier needed for this application to drive the EL sheets directly.

Bleistein & Handelsman, "Asymptotic expansions of integrals". Great book.

It also talks about neutralizer functions, which are cobbled-together combinations of absolute values and exp(-1/x) ( x->0+ ) that are really zero in regions you want to reject, really 1.0 in the ones you want to keep, and have continuous derivatives of all orders. (Sort of like a generalized version of JT's tanh curves.)

Cheers

Phil Hobbs

My set of RF bibles...

I also like Gardner's book on PLLs, Zverev's filter book, and high frequency amplifier books by Hollister, Carson, Hardy, and Staric & Margan.

I have an interesting looking one, Lee, "The design of CMOS radio frequency integrated circuits", but haven't read it yet.

I also picked up "Analog computer techniques" by Clarence L Johnson on ABE books, hoping it was by the famous Clarence L (Kelly) Johnson, but alas, it's by an aeronautics prof at the Air Force Institute of Technology. Fun though.

Cheers

Phil Hobbs

Whoa! Again today ;-) That sounds interesting! And only $13.99 on Amazon! Ordered, Prime, here Sunday ;-) Thanks! ...Jim Thompson

Nope. It's absolutely worthless except in the case where it's paralleled by a positive capacitor of value slightly greater than the negative value.

Yep, it does ;-)

Yes. The proof is left as an exercise for the student >:-} ...Jim Thompson