Question Regarding the Knee Frequency in High Speed Digital Design

[jack_pcb]

Hi all,

Can help anyone .
What is a Knee Frequency in high speed digital design and what is its Significance .
Urgent pls .

 

[Vengateswaran]

**broken link removed**
Go through this... you can understand the use of it... Actually knee frequency tells where the amplitude roll of begins.. bases on that, u can able to calculate the per decade value.

 

[marce]

Basicly it gives you the highest frequency harmonic that you have to concern yourself with when laying out the traces for digital signals, it is based on the signal rise time and is the main arbiter of whether a signal is high speed.

 

[jack_pcb]

Hi ,
thanks for the reply ,how should it be used at the time of trace routing .

 

[dehati]

Check out this one

http://referencedesigner.com/books/si/Knee-frequency.php

 

[marce]

Route all signals optimally and treat all as high speed (digital signals) without going overboard, unless they really require it (DDR memory etc.).