[SI-LIST] Re: Knee Frequency
- From: <colin_warwick@xxxxxxxxxxx>
- To: <lmoorthy.nimbeon@xxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 3 Nov 2009 05:55:19 -0700
Hi Lingamoorthi,
A while back, I posted a short video on the shape of the NRZ spectrum at:
http://signal-integrity.tm.agilent.com/2008/curious-nulls-in-the-nrz-spectrum/
The section towards the end explores the effect of rise/fall time on spectrum.
Hope this helps!
-- Colin Warwick
Signal Integrity Product Marketing Manager, Agilent EEsof EDA
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Tuesday, November 03, 2009 2:49 AM
To: lingomoorthy
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Knee Frequency
Below the knee frequency, harmonic energy falls off at an approximately
-1 slope. Above the knee frequency harmonic energy falls off at
approximately a -2 slope.
Steve.
lingomoorthy wrote:
> Hi Friends,
>
> Can you please let me know about Knee Frequency?
>
> I heard Fknee = 0.5/Tr, Tr is signal rise time.
>
> What will happen in digital circuit at Fknee, below Fknee and above Fknee?
>
> Thanks,
> Lingamoorthi
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