[SI-LIST] Re: Ghz/Gbs convert
- From: Patrick_Carrier@xxxxxxxx
- To: xlzhou@xxxxxxxxx, YTang@xxxxxxxxxxxxxxxxx,jooonguyen@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 24 Jun 2002 10:52:59 -0500
Mick--
T_r is independent of the frequency you are running; it is determined mainly
by the physical makeup of the buffers driving the signal. You could easily
have a 50MHz signal with a 100ps rise time. Conversely, you could have a
1Ghz signal with a 300ps rise time. The signal would not be very square, of
course, but could still work.
I guess the bottom line is that creating a rule for rise time in terms of
period is not at all valid. The two are independent.
--Pat
-----Original Message-----
From: Zhou, Xingling (Mick) [mailto:xlzhou@xxxxxxxxx]
Sent: Monday, June 24, 2002 10:13 AM
To: 'YTang@xxxxxxxxxxxxxxxxx'; jooonguyen@xxxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ghz/Gbs convert
I think you touched another point. Most of them are talking about data rate
and frequency, you are talking about the field bandwith (frequency). I can
not see direct relations between the two although we have a rule of thum
saying that t_r ~ T/10. Where T is the period. Obviously they are different
GHz with different physical meanings.
Regards,
Mick
-----Original Message-----
From: Yibing Tang [mailto:YTang@xxxxxxxxxxxxxxxxx]
Sent: Thursday, June 20, 2002 9:15 PM
To: jooonguyen@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ghz/Gbs convert
Joe,
There is relation between rise/fall time and bandwidth (base band
transmission)
BW*tr=0.35.
where BW is the bandwidth of the transmission link, tr is the resultant rise
time (if a square wave is transmitted via the link). For example, if
BW=3.5GHZ, then tr=0.1ns
Once you get the tr, you can decide the bit rates in Gbs of the link.
Hope it helps,
Yibing
-----Original Message-----
From: joe nguyen [mailto:jooonguyen@xxxxxxxxxxx]
Sent: Thursday, June 20, 2002 1:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ghz/Gbs convert
Dear Si Expert,
Just a silly question. How would you convert Ghz to Gbs? What is the rule
of thumb?
Thank you in advance,
JOe
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