[SI-LIST] Re: Correction: Re: IBIS-AMI Vendor Support Help
- From: "Dmitriev-Zdorov, Vladimir" <vladimir_dmitriev-zdorov@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 9 Feb 2010 10:57:10 -0700
Syed,
A minor addition. The procedure outlined below (generating step and
impulse from detailed SPICE level simulation) provides an accurate
response that AMI models and EDA platform will update and then use in
time domain simulation by way of convolution. At the simulation stage,
we can use complete non-linear models of Tx/Rx analog buffers.
However, a validity of superposition (by convolution) of the generated
responses assumes that Tx and Rx analog models are linear and time
invariant (e.g. buffers' IV curves are straight lines and do not change
in time)
Vladimir
----- Original Message -----
Date: Mon, 8 Feb 2010 20:42:11 -0500 (EST)
From: Todd Westerhoff <twesterh@xxxxxxxxxx>
Subject: [SI-LIST] Re: Correction: Re: IBIS-AMI Vendor Support Help
Syed,
...
I believe the way we generated the impulse response is the kit was by
simulating a step response for the TX / channel / RX in HSPICE. The
analog model we used for the RX represented the termination behavior
only. We then took the step response and differentiated it to get the
impulse response we included in the kit.
Since the impulse response included in the toolkit includes the analog
TX / channel / analog RX, running that impulse response with the TX
algorithmic model provides the signal at the RX pad. Processing *that*
waveform with a RX algorithmic model (not included in the kit) would
yield the data signal at the RX sampling point.
...
Todd.
--
Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA 01754
(978) 461-0449 x24
twesterh@xxxxxxxxxx
www.sisoft.com
----- Original Message -----
From: "Syed Huq (huqs)" <huqs@xxxxxxxxx>
To: twesterh@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Sent: Monday, February 8, 2010 4:27:36 PM
Subject: RE: [SI-LIST] Correction: Re: IBIS-AMI Vendor Support Help
Hi Todd,
Pls correct me if I am wrong. I believe a RX Analog front end is needed
(Along with a TX Analog IO model) for the Impulse response of the
Channel. So how is that possible in the tool kit without a RX model.
Tks
Syed
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