FreeLists / si-list / [SI-LIST] Re: Rise time bandwidth relation

[jaudet@xxxxxxxxxx]

Based on simple RC circuit... Vo=V*(1-e^(t/RC))
So apply it for 10% and 90% ( risetime )
Vo at 0.1= 0.1*V =  0.1*(1-e^(t at 0.1/(RC))
Vo at 0.9= 0.9*V =  0.9*(1-e^(t at 0.9/(RC))

tr=   t at 0.9 -  t at 0.1..... and by manipulation on previous equations 
you will find  tr = 2.2RC

fc= 1/ (2piRC).... 

so fc = 0.35/tr


Jean Audet
Electrical Analysis
STG / World Wide Packaging & Test
Organic and Ceramic Packages 
IBM Bromont
Tel: 450-534-6317, tie line: 552-6317
E-mail: jaudet@xxxxxxxxxx




Rohit Sharma <rohitsharma@xxxxxxxxxxxxx> 
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2007-05-07 11:00
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[SI-LIST] Re: Rise time bandwidth relation






Hi All,
   Can somebody help me in understanding the derivation of the following 
formula for digital signals:- 
 Bandwidth = 0.35/Rise time.

Regards,
Rohit



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