[ibis-macro] Re: Jitter BIRD issues, and Buffer Tstonefile Issues

From: Ambrish Varma <ambrishv@xxxxxxxxxxx>
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
Date: Tue, 6 Dec 2011 11:26:58 -0800

Walter,
Attached is an example as per the Cadence proposal.

Thanks,
Ambrish.


[cid:image002.gif@01CCB423.1C84C4E0]



Ambrish Varma   |  Member of Consulting Staff

P: 978.262.6431   www.cadence.com<http://www.cadence.com>










________________________________
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] 
On Behalf Of Muranyi, Arpad
Sent: Tuesday, December 06, 2011 1:33 AM
To: IBIS-ATM
Subject: [ibis-macro] Re: Jitter BIRD issues, and Buffer Tstonefile Issues

Walter,

Under 3b below, you requested an implementation of your
example with the syntax of my analog BIRDs.  Please
review the attached PDF file in which I attempted to
fulfill your request.  I hope I understood your example
correctly.

Comments/questions are appreciated.

Thanks,

Arpad
==========================================================

From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] 
On Behalf Of Walter Katz
Sent: Tuesday, November 29, 2011 4:31 PM
To: IBIS-ATM
Subject: [ibis-macro] Jitter BIRD issues, and Buffer Tstonefile Issues

All,

The remaining major issue is the handling of Rx_Rj, Rx_DCD, and Rx_Sj.

1.       It has been requested that Rx_Dj be added.

2.       First a discussion on how the Rx clock is handled in the following two 
cases

a.       Time Domain

                                                                                
      i.      Rx AMI_GetWave returns clock ticks in *clock_times.

b.      Statistical

                                                                                
      i.      Rx AMI_GetWave does not return clock ticks in *clock_times.

                                                                                
    ii.      Using Rx AMI_Init

3.       The current BIRD 123 states that Rx_Rj, Rx_DCD, and Rx_Sj shall be 
applied to both Time Domain and Statistical methods.

a.       In Time Domain, Rx_Rj, Rx_DCD, and Rx_Sj can be applied to times in 
clock_times, statistically to the clock_times PDF, or statistically to the 
persistent eye.

b.      In Statistical, Rx_Rj, Rx_DCD, and Rx_Sj are combined statistically 
along with Rx_Clock_PDF, Rx_Clock_Recovery_Rj, Rx_Clock_Recovery_DCD, and 
Rx_Clock_Recovery_Sj.

4.       It has been suggested that Rx_Rj, Rx_DCD, and Rx_Sj shall apply to 
just Time Domain.

a.       In Time Domain, Rx_Rj, Rx_DCD, and Rx_Sj can be applied to times in 
clock_times, statistically to the clock_times PDF, or statistically to the 
persistent eye.

b.      In Statistical, only Rx_Clock_PDF, Rx_Clock_Recovery_Rj, 
Rx_Clock_Recovery_DCD, and Rx_Clock_Recovery_Sj are applied.

Regarding Tstonefile.

1.       Fangyi and I agreed the there is no requirement that S12=S21, and that 
S21 can be small or zero.

2.       Fangyi and I agreed that the input to the Tx, and the output of the Rx 
S element be isolated with a unit gain amplifier (E element) as in the 
following example of a Tx Tstonefile wrapped in an ISS subckt:

a.    .subckt Intrinsic_Tstonefile_Tx DieP PadP DieN PadN file='NA'

b.    * Port order of Touchstone file is DieP PadP DieN PadN

c.    E_H EDieP 0 VCVS DieP 0 1.

d.    E_L EdieM 0 VCVS DieN 0 1.

e.    S1 EDieP PadP EDieN PadN 0 mname=A

f.    .model A TSTONEFILE=file

g.    .ends Intrinsic_Tstonefile_Tx

3.       There are now three proposals to implement Tstonefile in .ibs and/or 
.ami files.

a.       BIRD 120 proposes the following example, where  (Voh-Vol) = Peak to 
Peak voltage swing:

                                                                                
                              i.      (Tstonefile (List "xwc.s4p" "wc.s4p" 
"nc.s4p" "bc.s4p" "xwc.s4p")

                                                                                
                            ii.      (Usage Info) (Type String)

                                                                                
                          iii.      (Description "Extreme Worst, Worst, 
Nominal, Best, Extreme Best"))

                                                                                
                           iv.      (Vol  (Value 0.) (Usage Info)(Type Float))

                                                                                
                             v.      (Voh (Range 1 .3 1.2) (Usage Info)(Type 
Float))

b.      There are a number of BIRDs submitted by Arpad and Ambrish. I have 
requested that the above example be implemented using the syntax proposed in 
these alternative BIRDs.

Walter


Walter Katz
wkatz@xxxxxxxxxx<mailto:wkatz@xxxxxxxxxx>
Phone 303.449-2308
Mobile 720.333-1107

[Model] example_buffer
Model_type Output
|
| Other model sub-parameters are optional
|
|                 typ     min    max
[Voltage Range]   3.3     3.0    3.6
|
[Ramp]
dV/dt_r        1.57/0.36n   1.44/0.57n   1.73/0.28n
dV/dt_f        1.57/0.35n   1.46/0.44n   1.68/0.28n
|
[External Model]
 Language Touchstone
|
| Corner corner_name file_name        circuit_name
Corner    Typ         nc1.s2p   NA
Corner    Min         wc1.s2p   NA
Corner    Max         bc1.s2p   NA
|
| User_defined_corner user_defined_corner_name file_name                
corner_name
 User_defined_corner    Extreme_Worst                   xwc.s2p          Min
 User_defined_corner    Worst                                   wc.s2p          
 Min
 User_defined_corner    Nominal                         nc.s2p           Typ
 User_defined_corner    Best                                    bc.s2p          
 Max
 User_defined_corner    Extreme_Best                            xbc.s2p         
 Max

|
| Ports List of port names (in same order as in Touchstone)
 Ports my_drive A_signal 
| my_drive should be connected to port 1 of Touchstone A_signal should 
| be connected to port 2 of Touchstone
|
| D_to_A d_port   port1     port2    vlow vhigh trise tfall corner_name 
D_to_A   D_drive  my_drive  A_pdref   0.0  3.3  0.5n  0.3n   Typ
|
[End External Model]
|

References:
- [ibis-macro] Re: Jitter BIRD issues, and Buffer Tstonefile Issues
  - From: Muranyi, Arpad

[ibis-macro] Re: Jitter BIRD issues, and Buffer Tstonefile Issues

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