{"id":29314,"date":"2004-02-01T00:17:29","date_gmt":"2004-02-01T00:17:29","guid":{"rendered":"https:\/\/silvaco.com\/uncategorized\/instructional-approach-to-writing-parasitic-capacitance-rules-files-using-exact\/"},"modified":"2021-07-08T18:31:21","modified_gmt":"2021-07-09T01:31:21","slug":"instructional-approach-to-writing-parasitic-capacitance-rules-files-using-exact","status":"publish","type":"post","link":"https:\/\/silvaco.com\/ja\/simulation-standard\/instructional-approach-to-writing-parasitic-capacitance-rules-files-using-exact\/","title":{"rendered":"Instructional Approach to Writing Parasitic Capacitance Rules Files Using Exact"},"content":{"rendered":"
\n

Instructional Approach to Writing Parasitic Capacitance Rules Files Using\u00a0Exact<\/em><\/h1>\n

1. Introduction<\/p>\n

The\u00a0Exact<\/em><\/strong>\u00a0analysis stage extracts the user-required information necessary for the respective parasitic capacitances by probing the\u00a0Exact<\/em><\/strong>\u00a0database. This is performed via script files written in\u00a0LISA<\/em><\/strong>\u00a0(Language for Interfacing Silvaco Applications). This article demonstrates a systematic approach for writing analysis script files.<\/p>\n

2. Full Working\u00a0LISA<\/em>\u00a0script file<\/p>\n

Firstly a full workable analysis script file is detailed; explanatory discussion then follows.<\/p>\n

!***********BEGIN LISA SCRIPT***********
\n!Performs numerical fit to determine near body effect on fringe down
\ncapacitance data. Text
\n!following an exclamation mark is a comment.
\nLayouts referred to in the script are Parallel
\n!Plate.pml (termed PP…) and OneArray.pml (termed OA…).<\/span><\/p>\n

!Load in the internal database
\ndb = DatabaseLoad(\u201c.\u201d);<\/span><\/p>\n

!Create capacitance variables and assign capacitance values to them
\nextract_name(\u201cPP_Ctotal\u201d, \u201cB_gnd\u201d, \u201cPlate\u201d);
\nextract_name(\u201cOA_Ctotal\u201d, \u201cB_gnd\u201d, \u201cL1p\u201d);<\/span><\/p>\n

!Decide which combinations are to be examined and included in the tables.
\nPP_combinations = {1};
\nOA_combinations = {1};<\/span><\/p>\n

!create table for parallel plate information
\ntable_PP= select(db, \u201cParallelPlate\u201d, PP_combinations,
\n{\u201cParallelPlatePlateWidth\u201d},
\n{\u201cPP_Ctotal\u201d});<\/span><\/p>\n

!change units of capacitance to fF
\ncolumn_scalar_op(table_PP, \u201cPP_Ctotal\u201d,
\ntable_PP, \u201cPP_Ctotal\u201d, \u201c*\u201d, 1e15);<\/span><\/p>\n

!save the table for reference purposes
\nsave_table(table_PP, CSV, \u201cPP_a.csv\u201d);<\/span><\/p>\n

!create table for fringe down capacitance information.
\ntable_OA= select(db, \u201cOneArray\u201d, OA_combinations,
\n{\u201cOneArrayPlateWidth\u201d,
\n\u201cOneArrayLayer1Space\u201d, \u201cOneArrayLayer1Width\u201d},
\n{\u201cOA_Ctotal\u201d});<\/span><\/p>\n

!change capacitance units to fF
\ncolumn_scalar_op(table_OA, \u201cOA_Ctotal\u201d, table_OA,
\n\u201cOA_Ctotal\u201d, \u201c*\u201d, 1e15);<\/span><\/p>\n

!save output table for reference purposes
\nsave_table(table_OA, CSV, \u201cOA_a.csv\u201d);<\/span><\/p>\n

!Perform operations on table_OA to obtain fringe down capacitance.<\/span><\/p>\n

merge(table_PP, \u201cPP_Ctotal\u201d, table_OA);
\nsave_table(table_OA, CSV, \u201cOA_b.csv\u201d);<\/span><\/p>\n

column_vector_op(table_OA, \u201cPP_Ctotal\u201d,
\ntable_OA, \u201cOneArrayLayer1Width\u201d,
\ntable_OA, \u201cOA_Carea\u201d, \u201c*\u201d);
\ncolumn_vector_op(table_OA, \u201cOA_Ctotal\u201d,
\ntable_OA, \u201cOA_Carea\u201d, table_OA,
\n\u201cOA_FD_alpha\u201d, \u201c-\u201d);
\ncolumn_scalar_op(table_OA, \u201cOA_FD_alpha\u201d,
\ntable_OA, \u201cOA_FD\u201d, \u201c\/\u201d, 2.0);<\/span><\/p>\n

save_table(table_OA, CSV, \u201cOA_c.csv\u201d);
\nsave_table(table_OA, TONYPLOT, \u201cOA_c.str\u201d);<\/span><\/p>\n

!Equations for fringe down with near body effect.<\/span><\/p>\n

equationFD=\u201dOA_FD=1.0*K1[0.01]*(1.0-exp(- K2[0.09]*
\n(${OneArrayLayer1Space}+K3[0.03])))\u201d;<\/span><\/p>\n

res_OA = (calculate_fit(equationFD)(table_OA)(sum_combinations
\n(OA_combinations))(\u201cFD_OA.rsm\u201d)(\u201cDownhill-Simplex\u201d));<\/span><\/p>\n

save_table(res_OA, CSV, \u201cOA_FDcoeff.csv\u201d);<\/span><\/p>\n

! Header notes
\nwrite_parameters(\u201ceg1.xcl\u201d, table_PP, {\u201c\\n\/\/ Example script
\nfor Exact2 manual\\n\u201d});
\nwrite_parameters(\u201ceg1.xcl\u201d, table_PP, {\u201c\\n\\n\u201d});
\nwrite_parameters(\u201ceg1.xcl\u201d, table_PP, {\u201cUNIT LENGTH um\\nUNIT
\nCAPACITANCE fF\\n\\n\u201d});<\/span><\/p>\n

!Write text for area capacitance expression and
\nfringe down capacitance expression<\/span><\/p>\n

write_parameters(\u201ceg1.xcl\u201d, table_PP, {\u201cCAPACITANCE
\nCROSSOVER PLATE \u201c, \u201cLAYER0\u201d, \u201c \u201c, \u201cLAYER1\u201d,
\n\u201c\\n\\n[\\n\\n C =\u201d, \u201cPP_Ctotal\u201d, \u201c*area()\\n\\n]\\n\\n\u201d});<\/span><\/p>\n

write_parameters(\u201ceg1.xcl\u201d, res_OA, {\u201cCAPACITANCE
\nCROSSOVER FRINGE \u201c, \u201cLAYER0\u201d, \u201c \u201c, \u201cLAYER1\u201d,
\n\u201c\\n\\n[\\n\\n C =length()*\u201d, \u201ck1\u201d, \u201c*(1.0-exp(-\u201d, \u201ck2\u201d,
\n\u201c*(distance()+\u201d, \u201ck3\u201d, \u201c)))\\n\\n]\\n\\n\u201d});<\/span><\/p>\n

!*************END SCRIPT FILE**************<\/span><\/p>\n

Main output from the script file: capacitance rule file eg1.xcl<\/p>\n

UNIT LENGTH um
\nUNIT CAPACITANCE fF<\/span><\/p>\n<\/div><\/section><\/div>

<\/div>