[SI-LIST] Re: Ghz/Gbs convert


Let me explain it in this way.

1, from bandwidth(GHz) to data rates(Gb/s)
When you design a transmission line, it usually has limited bandwidth due to
dielectric loss and skin effect. Let's say it has bandwidth BW. For a
limited BW, you will sure have a limited edge rate tr. For a specific tr,
you can decide the maximum data rate of the transmission line. For example,
for 20ps rise time system, you can transmit 10Gb/s. This depends on what
shape you want your signal to be at the receiver end.

2, from Gb/s to GHz
Also depends on how many higher orders of harmonic wave you want to transmit
through the transmission line. This will determine the signal shape at the
receiver end. You can find the information to get a power spectrum of a
digital signal in many textbooks.

Regards,
Yibing




-----Original Message-----
From: Zhou, Xingling (Mick) [mailto:xlzhou@xxxxxxxxx]
Sent: Monday, June 24, 2002 10:05 AM
To: 'Patrick_Carrier@xxxxxxxx'; Zhou, Xingling (Mick); Yibing Tang;
jooonguyen@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Ghz/Gbs convert


100% agree. Thanks.

Mick

-----Original Message-----
From: Patrick_Carrier@xxxxxxxx [mailto:Patrick_Carrier@xxxxxxxx]
Sent: Monday, June 24, 2002 11:53 AM
To: xlzhou@xxxxxxxxx; YTang@xxxxxxxxxxxxxxxxx; jooonguyen@xxxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Ghz/Gbs convert


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

_________________________________________________________________
Join the world's largest e-mail service with MSN Hotmail. 
http://www.hotmail.com

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: