>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 31 October 2006 13:50
>To: piclist@mit.edu
>Subject: [EE] Square wave has curved edges?
>
>
>Hi List,
>
>I have the following question, I am observing a square wave
>on a scope and the edges are slightly curved instead of 90 
>degrees. I was wondering why this phenomena occurs only on one 
>side of the wave, I sketch with ascii to explain what I mean.
>
>Normal square wave:
>
>*   *   *
>*        *
>*        *
>*        *        *
>          *        *
>          *        *
>          *   *   *
>
>Curved square wave:
>
>  * *   *
>*        *
>*        *
>*        *        *
>          *        *
>          *        *
>            * *   *


Squave waves are great for giving a rough idea about the frequency response of a circuit.  The sloping sides and rounded "corners" are indicative of a limited high frequency response.  If the top of the wave tends to slope toward 0 volts, then it shows limited low frequency response.

Regards

Mike

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