Help regarding - PWM pulse distortion

jaikumar · Joined: 15 Dec 2006 Posts: 109

Hi All,

I require 2Khz, 2us pulse. I was able to get this pulse with a 8Mhz crystal.
But I find there is a shoot up during the pulse rise and pulse fall time. How do I prevent this?

uC - 16F877A.
Clock - external crystal - 8Mhz.
compiler - ccs 4.138

Thanks & Regards,
Jai

bkamen · Posted: Wed Nov 28, 2012 1:16 am

What you are looking at is called inductive ringing.

What you need to learn about is transmission line theory and proper termination of high speed digital signals.

here's a quick answer from google:

http://www.geotestmts.com/KnowledgeBase/KBArticle.aspx?ID=196
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

jaikumar · Joined: 15 Dec 2006 Posts: 109

Thank you for guiding me.

regards,
jai.