[SI-LIST] Re: HSPICE xtalk simulation
- From: "Lakshmi Narayanan Sowrirajan, ERS-HCLTech" <lakshminarayanans@xxxxxxx>
- To: Kamesh Pidaparthy <kpidaparthy@xxxxxxxxxx>
- Date: Tue, 22 Mar 2011 10:39:29 +0530
Hi Kamesh,
Thanks for the reply, please find the below understanding for the
numbers given, correct me if I am wrong.
--------------- (1)
4mil spacing
--------------- (2)
8mil spacing (2X spacing b/w pairs)
--------------- (3)
4mil spacing
--------------- (4)
SP12 = 4mils = 0.0001016 meter
SP13 = 12mils = 0.0003048 meter (2X spacing between adjacent pair)
SP14 = 16mils = 0.0004064 meter (4mil space to form the second differential
pair)
SP12 = 4 mils
(SP14-SP13) = 16-12 = 4 mils
I am doing simulation by changing both SP13 and SP14 keeping the differential
spacing as 4 mil constant and changing the pair to pair spacing to get
crosstalk levels for different air gap levels.
Calculation for 3X spacing
-------------------------------
SP12 = 4mils = 0.0001016 meter
SP13 = 16mils = 0.0004064 meter (3X spacing between adjacent pair)
SP14 = 20mils = 0.0005080 meter (4mil space to form the second differential
pair)
SP12 = 4 mils
(SP14-SP13) = 20-16 = 4 mils
Even with the above steps I am not seeing any change in the crosstalk voltage.
Thanks & Regards
Lakshminarayanan. S
9840250902
-----Original Message-----
From: Kamesh Pidaparthy [mailto:kpidaparthy@xxxxxxxxxx]
Sent: Monday, March 21, 2011 9:37 PM
To: Lakshmi Narayanan Sowrirajan, ERS-HCLTech; si-list@xxxxxxxxxxxxx
Subject: RE: HSPICE xtalk simulation
Just my two cents. To vary the space between the pairs, you should vary both
SP13 and SP14 equally so that (SP14 minus SP13) is always stays constant and
same as SP12 since they are pairs. From your data it looks like you are varying
only SP13.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Lakshmi Narayanan Sowrirajan, ERS-HCLTech
Sent: Monday, March 21, 2011 12:14 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: HSPICE xtalk simulation
Hi All,
Awaiting for your reply for the below request.
Thanks & Regards
Lakshminarayanan. S
9840250902
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Lakshmi Narayanan Sowrirajan, ERS-HCLTech
Sent: Wednesday, March 16, 2011 4:20 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: HSPICE xtalk simulation
Hi HSPICE Experts,
I need a help on using U element for X-talk simulations.
With the SP parameter in the U model definition we will be able
to define the distance between the conductors. Please let me know how we can
specify different spacing between each conductor. Refer below configuration for
the same.
L1-L2 => 4mils
L2-L3 => 8mils (2x spacing)
L3-L4 => 4mils
Basically I would like to have x-talk simulation for two
differential pairs (1,2 & 3,4) with different spacing, say 2X, 3X & 4X. Please
let me know how I can do this with the U element or any other elements.
U1 208 216 109 106 0 105 102 111 108 0 micro1 L=0.076200
.model micro1 U LEVEL=3 PLEV=1 DLEV=1 ELEV=1 LLEV=1 NL=4 wd=0.0001524
ht=0.000254 th=0.00003556 thb=0.00003556 SP12=0.0001016 SP13=0.0003048
SP14=0.0004064 KD=4.2
I have used the above command lines. But even by varying the SP13 I am not
seeing any change in the x-talk voltage at node 108 & 111. Differential
stimulus is driven at 208 & 216.
Thanks & Regards
Lakshminarayanan. S
9840250902
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