The inverters in your buffers take some time to turn on. You can quantif= y this by measuring the time at the midpoint (or Vih or Vil point) of the rising/falling edge of the output signal minus the same point from the stimulus pulse. Also, the loading on the line will affect this measureme= nt. Regards, Patrick Zilaro SI Packaging Engineer Broadcom Corporation -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]O= n Behalf Of manthos labropoulos Sent: Friday, October 31, 2003 2:15 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Repeaters in DSM interconnects Hi all I have a problem and i would like your help. I am trying to observe how repeaters(buffers) influence propagation delay of signals in DSM interconnects. However it is supposed repeaters to decrease the total propagation delay (if used in a sofisticated way), i always take an increase in the total propagation delay. I am modeling interconnects with either an RC or with an RLC model. For example i am inserting a buffer in the middle of a 5000um long conductor and i am comparing it with the delay of a 5000um long unbuffered interconnect (in both cases inverters are placed as the driver and the receiver). The propagation delay in the case of the buffered interconnect is longer. Can you explain it to me ? Is it supposed the delay to be decreased since the delay depends on the l^2 (where l is the length of the intherconnect) ? I am using inverters of equal or more strength in the buffers (for the buffer i am connecting an even number of inverters in series, usualy 2 inverters). Where do you think the problem may be ? Thanks for your time. Matheos ____________________________________________________________ Do You Yahoo!? =C1=F0=EF=EA=F4=DE=F3=F4=E5 =F4=E7 =E4=F9=F1=E5=DC=ED @yahoo.gr =E4=E9=E5= =FD=E8=F5=ED=F3=E7 =F3=E1=F2 =F3=F4=EF http://www.otenet.gr ------------------------------------------------------------------ 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: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //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: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //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