[ibis-macro] Re: Summary and recomendations regarding Analog Buffer Modeling discussion (Tstonefile, ...)
- From: "Walter Katz" <wkatz@xxxxxxxxxx>
- To: "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
- Date: Wed, 07 Dec 2011 14:31:56 -0500 (EST)
All,
I clarified the statement about "Equivalent-Circuit Rx and Tx defined in
BIRD 122" to include" in the models AMI operating range".
Walter
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Walter Katz
Sent: Wednesday, December 07, 2011 12:18 PM
To: IBIS-ATM
Subject: [ibis-macro] Summary and recomendations regarding Analog Buffer
Modeling discussion (Tstonefile, ...)
All,
First I will review various features of BIRDS 116, 122, and 144, and then
make several recommendations.
For [Model]s that have an AMI model
Tstonefile
BIRD 116 requires an ISS subckt file containing an S element instance, and
requires parsing a number of lines in the [External Model] section to
determine what is defined the BIRD 122 AMI parameters Tstonefile,
Nodemap, Voh, Vol, Trf.
Equivalent-Circuit Rx and Tx defined in BIRD 122
The Equivalent-Circuit Rx and Tx defined in BIRD 122 accurately represent
the differential response in the models AMI operating range of legacy IBIS
models that have a constant differential impedance and do not have VT
curves (i.e. Use dV/dt_r and dV/dt_f instead of VT curves). This includes
Series Pin and Termination models. (The Equivalent-Circuits will need to
be enhanced to include some inductors).
Differential ISS subckts.
Both BIRD 122 and 116 enable a model to define an File and Subckt for a
Differential ISS subckt.
For [Model]s that do not have an AMI model
BIRD 116 allows the user to use an ISS subckt to represent the Analog
Model
Recommendations
Enhance BIRD 116 to allow the following Languages, and keywords for each
language (keyword names and syntax TDB)
Touchstone
Tstonefile
Nodemap
Vol
Voh
Trf
Generic_Tx
Vol
Voh
Trf
Rs
Rd
Rt
Cd
Cc
Rac
Cac
Ls
Lt
Ld
Generic_Rx
Rd
Rt
Cd
Cc
Rac
Cac
Lt
Ld
ISS
As defined in BIRD 116
BSS
This is same as ISS, except the subckt is compliant with IBIS Buffer Spice
Subckt (IBIS BSS). IBIS BSS is a superset of IBIS ISS. IBIS BSS contains
additional elements, such as PWL controlled sources, event detectors, and
timers. IBIS BSS subckt can be written to be equivalent to a compliant
legacy "B" element.
Approve both BIRD 122 and 116 (or combine them into a single BIRD, so that
AMI model developers can put Tstonefile, Equivalent-Circuit Rx and Tx, and
Differential ISS subckts in either the .ami file and or the .ibs file
Reject BIRD 144
Walter
Walter Katz
wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 720.333-1107
Other related posts:
