[ibis-macro] Re: another silly IBIS-AMI question about deriving the impulse response of a channel

  • From: Scott McMorrow <scott@xxxxxxxxxxxxx>
  • To: Walter Katz <wkatz@xxxxxxxxxx>
  • Date: Thu, 27 May 2010 18:31:50 -0400

Walter

you would be incorrect.
"Lumped approximations between TxTerm/TxPad and RxTerm/RxPad do not hold"

A simulation based upon your assumption would have large errors.

Scott




On 5/27/2010 6:31 PM, Walter Katz wrote:


Scot,

I think a better picture is:
TxTerm --- TxDie --- TxBump -- TxPkg -- channel -- RxPkg -- RxBump -- RxDie --- RxTerm 
  | |
  |   |
TxPad RxPad

Walter

Walter Katz

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Mobile 720.333-1107

wkatz@xxxxxxxxxx

www.sisoft.com

-----Original Message-----
*From:* Scott McMorrow [mailto:scott@xxxxxxxxxxxxx]
*Sent:* Thursday, May 27, 2010 6:25 PM
*To:* Walter Katz
*Cc:* IBIS-ATM
*Subject:* Re: [ibis-macro] another silly IBIS-AMI question about deriving the impulse response of a channel 

Walter,
You are misinterpreting my picture. I was showing the network of just a Tx or Rx. When I say "network" I truly mean a circuit network. Let me create a better picture of the entire channel.
TxTerm --- TxDie --- TxBump -- TxPkg -- channel -- RxPkg -- RxBump -- RxDie --- RxTerm 
             |                                                          |
             |                                                          |
TxPad RxPad 


For a 50 ohm single-ended channel

TxTerm = 50 ohm
RxTerm = 50 ohm
TxPad = some high impedance
RxPad = some high impedance
Lumped approximations between TxTerm/TxPad and RxTerm/RxPad do not hold

What I was showing was just one part of the total channel.

(50 ohm)RxBump --- Network --- RxTerm (50 ohm)
                      |
                      |
                    RxPad
                   (10k ohm)



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