[SI-LIST] Re: rise time and bandwidth
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 13 Sep 2011 20:22:51 -0700
Bandwidth usually means the -3dB bandwidth. For a waveform that is a
step fed into a single pole network the 10% to 90% rise-time at the
output of the network gives you the 0.35/Tr equation. Equipment
manufacturers routinely apply signal processing to derive response
beyond -3dB, sometimes with mixed results. The guys with the faster
transistors argue with the guys who do more signal processing about
which gear provides the more accurate result based on other factors such
as signal to noise, linearity, etc.
Steve.
On 9/13/2011 7:50 PM, Kevin Li wrote:
> Hi, experts,
> I am new to this field and I get a question for you guys. I saw a formula
> saying BW=0.35/Trise. So for a TDR module with 30ps rise time I should get a
> BW of 11.67GHz. Am I correct on this? I saw from a TDR spec that for 30ps
> rise time, the BW was 20GHz. That confused me.
>
> Thanks.
> Kevin
>
>
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--
Steve Weir
IPBLOX, LLC
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
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