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Simulators >> Circuit Simulators >> point to point ringing in some integration methods
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Message started by jefkat on Apr 22^nd, 2007, 8:54am

Title: point to point ringing in some integration methods
Post by jefkat on Apr 22^nd, 2007, 8:54am

Hi..
I am trying to understand why would some integration methods result in ringing (especially when the time constants are smaller than the time step). Intutively thinking I would miss some signal detail (due to fast poles) but downright ringing !! cant seem to make sense of it..Anyone with some commenst to put me on the right track of thinking?

Thanks much!
jefkat

Title: Re: point to point ringing in some integration met
Post by mg777 on Apr 22^nd, 2007, 11:37pm

Think of an integration algorithm as a difference equation, with an impulse response. You can have underdamped filters like Adams-Bashford which use extrapolation. Implicit methods can reduce the overshoot in the impulse response, while Runge-Kutta will tend to be damped.

Refer to the revered 'Numerical Methods in C' for further illumination.

M.G.Rajan
www.eecalc.com

Title: Re: point to point ringing in some integration met
Post by Andrew Beckett on Apr 30^th, 2007, 5:37am

Or for a more accessible book for designers, look at Ken's book http://www.designers-guide.org/Books/#Kundert-1995 A Designer's Guide to SPICE and Spectre, page 150.

Regards,

Andrew.