Hi Agathon, Where in the stack should the conductors be located? From the conductor coordinates given in your model, the conductors are embedded in the ground plane. .MODEL ... ... + CONDUCTOR=3D(ORIGIN=3D(0 0) MATERIAL=3Dcopper SHAPE=3Dtrace) + CONDUCTOR=3D(ORIGIN=3D(255.6u 0) MATERIAL=3Dcopper SHAPE=3Dtrace) All conductor locations should have the y dimension greater than 0. Tracy Barclay CAE Synopsys, Inc. =20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of agathon Sent: Tuesday, October 30, 2007 16:25 To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] HSpice field-solver syntax for trapezoidal stripline pair Greetings, Now that I'm being subjected to the #(@&!!!?$@$# ! HSpice field solver, could someone have mercy on me and straighten me out? Solvnet is too busy handling the geometric increase in user issues. I've googled and have the Synopsys manual, all of which either aren't clear or (in the case of synopsys) tell absolutely nothing. I'm confident the only issue is the SHAPE and ORIGIN numbers in the deck below. The design is asymm. stripline. MANY THANKS.... Somebody needs to take away Synopsys' ice cream cone, for sure. I use the following deck below and get an error, using ver2007.09 : IR2D: 2D field solver for magnetic coupling effect IR2D: setup IR2D: Setting Matrix Error:Maximum Number of GMRES iterations reached: 500 residue: nan >error ***** hspice job aborted design... trace sep =3D 355.6micron trace width =3D 120.65/133.35 (trapez. 0.5mil factor) trace thickness =3D 15.24micron (0.6mil) stack... 0.6mil plane - top 3.9mil prereg 14mil core 0.6mil sig 3.9mil prereg 0.6mil plane The deck below generates the RLGC table file. ---------------------------------------------------------------------- .Title 100ohm asymm diff stripline -- field solver Wfs_diffstrip_asymm_rough in1 in2 0 out1 out2 0 N=3D2 l=3D1 + FSmodel=3Ddiffstrip_asymm_rough + PRINTZO=3DLIN 64 0 1.5625g + MIXEDMODE=3D1 .FSOPTIONS fsopt accuracy=3Dhigh printdata=3Dyes computegd=3Dyes computers=3Diter + computego=3Dyes computero=3Dyes computetable=3DLIN 64 0 1.5625g .SHAPE trace POLYGON VERTEX=3D( + 100u 114.3u 112.7u 99.06u 220.65u 99.06u 233.35u 114.3u) .MATERIAL copper METAL CONDUCTIVITY=3D59.6meg = roughness=3D2u .MATERIAL prepreg DIELECTRIC ER=3D3.31 LOSSTANGENT=3D0.012 .MATERIAL core DIELECTRIC ER=3D4.07 LOSSTANGENT=3D0.012 .LAYERSTACK stack1 + LAYER=3D(copper,15.24u) + LAYER=3D(prepreg,99.06u) + LAYER=3D(core,355.6u) + LAYER=3D(prepreg,99.06u) + LAYER=3D(copper,15.24u) .MODEL diffstrip_asymm_rough W MODELTYPE=3DFieldSolver + FSOPTIONS=3Dfsopt RLGCFILE=3Ddiffstrip_asymm_rough.rlgc + LAYERSTACK=3Dstack1 + CONDUCTOR=3D(ORIGIN=3D(0 0) MATERIAL=3Dcopper SHAPE=3Dtrace) + CONDUCTOR=3D(ORIGIN=3D(255.6u 0) MATERIAL=3Dcopper SHAPE=3Dtrace) .end ------------------------------------------------------------------------ ---------------------------- ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu