[SI-LIST] Re: Repeaters in DSM interconnects

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

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