[SI-LIST] 3-db bandwith of system
- From: Bob Patel <whizplayer@xxxxxxxxx>
- To: si_list <si-list@xxxxxxxxxxxxx>
- Date: Thu, 27 Sep 2001 17:57:56 -0700 (PDT)
Hi! I had a couple of questions regarding the
measurement of bandwith of a system and I am trying to
pose what I am doing and see if you'l agree or suggest
something else.
1)In order to measure the 3db bandwith of the system I
take a differntial TDT response of the SMA cables i.e.
connect the SMA cables from CH1 to CH3 and CH2 to CH4.
I store this in memory.
2)Now I connect the cables to the i/p and o/p of my
system and get the differential TDT response.
3)Now, I measure the rise time of storewaveform in
memory and rise time of system
4)Get the RMS rise time loss=(triseout^2 -
trisein^2)^0.5
5)F3db= 0.35/rms rise time loss
A)Is this Ok in getting a good measured result of the
3 db bandwith of my system?
B)For transmission of data at 5GB/s is 3db bandwith
measurement OK or should I use 6db bandwith.
Thanks in advance.
Bob
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