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Re: LTspice crashes when using frequency lookup tables
eternalesquire
Mike,
I'm thankful for your promptness. This is GREAT customer service! Andrew McClelland P.S. I'm interested in integrating this with other tools like VIPEC (an S-chart analyser) or GEDA (GNU pc board routing and placement). Do you perhaps have a DLL or COM interface/API? Thanks again! --- In LTspice@..., Panama Mike <panamatex@y...> wrote: Andrew,message:I've been trying to use microwave and other devices which are only
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Re: LTspice crashes when using frequency lookup tables
Andrew,
I've been trying to use microwave and other devices which are onlyThanks for reporting the problem. The crash mode was inadvertently introduced on Sept 15 of last year while trapping a different problem. I'll put up an update next week to take care of that problem. BTW, your data points are entered as "(171.56MHz,-28.99,86.06)" You probably meant "(171.56Meg,-28.99,86.06)" --Mike __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. |
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Tstart, Tstop
Ron
I ran a sim with start time=0 and zoomed in on a portion of the
waveforms near the end of the sim. I then re-ran the sim with Tstart and Tstop specified as the beginning and end, respectively, of the zoomed waveforms view. For example, let's say I zoomed in so that my time scale started at 895 usec and ended at 927 usec. I then set Tstart=895u and Tstop=927u. To my surprise (and dismay), the results were different! Has anyone else noticed this problem? Thanks, Ron Harrison |
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Re: LTspice crashes when using frequency lookup tables
--- In LTspice@..., "eternalesquire" <eternalsquire@c...>
wrote: Dear Mike and Helmut (and others):SPICE model.message: something differently, or is this actually a bug which needs to be fixed, andif so, when can us we expect an update? Hello Andrew, first of all, I am not knowing the ineternals of LTSPICE. I tried your circuit and LTSPICE crashed the same. Then I made a very simple test circuit. My findings are that it seems to be impossible to use sources with FREQ tables for .TRAN analysis. It also crashes with .TRAN, but not with .AC . It is also interesting to see how interpolation in the frequency domain is done. Look at V(3). It is a simple lowpass filter (fg=1kHz). Mike have to tell us whether my assumptions are true or not. Best Regards Helmut PS: I am not an employee of LT. Test circuit test.asc . Take care about broken lines , because of this awful YAHOO messengers. Version 4 SHEET 1 880 680 WIRE 0 192 0 144 WIRE 0 144 208 144 WIRE 0 272 0 320 WIRE 368 192 368 144 WIRE 368 272 368 320 WIRE 368 144 320 144 WIRE 208 144 208 208 WIRE 208 288 208 320 FLAG 368 144 3 FLAG 0 144 1 FLAG 0 320 0 FLAG 368 320 0 FLAG 208 320 0 SYMBOL voltage 0 176 R0 WINDOW 123 24 132 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value2 AC 1 SYMATTR InstName V1 SYMATTR Value SINE(0 1 2000) SYMBOL res 352 176 R0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL res 192 192 R0 SYMATTR InstName R2 SYMATTR Value 1k TEXT -144 48 Left 0 !E1 3 0 FREQ {V(1,0)}=(10,0,0) (1000,-3,-45) (10k,-20,-90) TEXT -152 -24 Left 0 !.AC DEC 100 1 20k TEXT -144 8 Left 0 ;.TRAN 10m |
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LTspice crashes when using frequency lookup tables
eternalesquire
Dear Mike and Helmut (and others):
I've been trying to use microwave and other devices which are only expressed in s2p format, for which the company does not offer a SPICE model. I followed the Pspice application note in converting s2p data into a 2-port spice model. I believe my resulting figures are correct. However, LTspice 2.02p (Apr 24 2003) crashes with the following message: SCAD3 caused an invalid page fault in module SCAD3.EXE at 0177:005465ce. Registers: EAX=009c4be0 CS=0177 EIP=005465ce EFLGS=00010202 EBX=0099d840 SS=017f ESP=00c7f868 EBP=00c7fa94 ECX=00000001 DS=017f ESI=00a99350 FS=218f EDX=00000424 ES=017f EDI=009c4be0 GS=0000 Bytes at CS:EIP: 83 39 01 7e 0d 68 74 e5 68 00 e8 13 c9 fa ff 83 Stack dump: 00a99354 00000001 00a99350 000027e4 0000001c 0000002c 00000020 009c4be0 00000000 0096000c 00960000 00995708 00000000 00000001 00611660 00000000 Can you or anyone else please tell me if I need to configure something differently, or is this actually a bug which needs to be fixed, and if so, when can us we expect an update? I'm placing the data in this post in case you have attachment blockers. Thanks in advance!!! Andrew McClelland eternalsquire@... My data is as follows: ------------- coilcraft.net ------------- * C:\WINDOWS\Desktop\designs\coilcraft.asc V1 N002 0 SINE(0 1 60000) R2 N001 0 1000000 X1 N002 N001 N003 06cs3n3 R1 N003 0 1000000 .tran 0 .0001 0 .00001 .inc d:\progra~1\ltc\swcadiii\lib\sub\06cs3n3.sub .backanno .end ------------- coilcraft.asy (located in d:\progra~1\ltc\swcadiii\lib\sym) ------------- Version 4 SymbolType CELL RECTANGLE Normal 32 13 -34 -15 TEXT 1 51 Bottom 0 CoilCraft SYMATTR Prefix X SYMATTR SpiceModel 06cs3n3 SYMATTR Description CoilCraft Inductor PIN -32 0 LEFT 8 PINATTR SpiceOrder 1 PIN 32 0 RIGHT 8 PINATTR SpiceOrder 2 PIN 0 16 BOTTOM 8 PINATTR SpiceOrder 3 ----------- 06cs3n3.s2p ----------- ! Coilcraft 0603CS-3N3 Chip Inductor ! 1 August 2002 # MHZ S MA R 50 !Freq MagS11 AngS11 MagS21 AngS21 MagS12 AngS12 MagS22 AngS22 1 0.000234224326 62.2575033 0.99989099 -0.0118787051 0.99989099 -0.0118787051 0.000234224326 62.2575033 43.64 0.00906313175 85.638131 0.999351559 -0.518118178 0.999351559 -0.518118178 0.00906313175 85.638131 86.28 0.0178923066 86.2661558 0.998994383 -1.02406187 0.998994383 -1.02406187 0.0178923066 86.2661558 128.92 0.0267155736 86.2623404 0.998614361 -1.52973496 0.998614361 -1.52973496 0.0267155736 86.2623404 171.56 0.0355316588 86.0555185 0.998185387 -2.03511166 0.998185387 -2.03511166 0.0355316588 86.0555185 214.2 0.0443391802 85.7538407 0.997697385 -2.54015386 0.997697385 -2.54015386 0.0443391802 85.7538407 256.84 0.053136687 85.3990479 0.997145294 -3.04481802 0.997145294 -3.04481802 0.053136687 85.3990479 299.48 0.0619226905 85.0111173 0.996526228 -3.54905776 0.996526228 -3.54905776 0.0619226905 85.0111173 342.12 0.0706956814 84.6009777 0.99583843 -4.05282503 0.99583843 -4.05282503 0.0706956814 84.6009777 384.76 0.0794541408 84.1751868 0.995080807 -4.55607082 0.995080807 -4.55607082 0.0794541408 84.1751868 427.4 0.0881965474 83.7379567 0.994252689 -5.05874552 0.994252689 -5.05874552 0.0881965474 83.7379567 470.04 0.0969213827 83.2921396 0.993353696 -5.56079926 0.993353696 -5.56079926 0.0969213827 83.2921396 512.68 0.105627135 82.8397501 0.992383657 -6.06218202 0.992383657 -6.06218202 0.105627135 82.8397501 555.32 0.114312302 82.3822618 0.991342565 -6.56284388 0.991342565 -6.56284388 0.114312302 82.3822618 597.96 0.122975394 81.9207845 0.990230534 -7.06273504 0.990230534 -7.06273504 0.122975394 81.9207845 640.6 0.131614937 81.4561755 0.989047786 -7.56180599 0.989047786 -7.56180599 0.131614937 81.4561755 683.24 0.140229472 80.9891118 0.987794624 -8.06000753 0.987794624 -8.06000753 0.140229472 80.9891118 725.88 0.14881756 80.5201383 0.98647143 -8.55729087 0.98647143 -8.55729087 0.14881756 80.5201383 768.52 0.157377781 80.0497013 0.985078648 -9.05360771 0.985078648 -9.05360771 0.157377781 80.0497013 811.16 0.165908737 79.5781722 0.983616781 -9.54891023 0.983616781 -9.54891023 0.165908737 79.5781722 853.8 0.174409053 79.1058642 0.982086382 -10.0431512 0.982086382 -10.0431512 0.174409053 79.1058642 896.44 0.182877378 78.6330449 0.980488052 -10.5362839 0.980488052 -10.5362839 0.182877378 78.6330449 939.08 0.191312385 78.1599457 0.978822436 -11.0282625 0.978822436 -11.0282625 0.191312385 78.1599457 981.72 0.199712775 77.6867685 0.977090217 -11.5190416 0.977090217 -11.5190416 0.199712775 77.6867685 1024.36 0.208077275 77.2136914 0.975292117 -12.0085765 0.975292117 -12.0085765 0.208077275 77.2136914 1067 0.216404641 76.740873 0.97342889 -12.4968235 0.97342889 -12.4968235 0.216404641 76.740873 1109.64 0.224693658 76.268455 0.971501323 -12.9837395 0.971501323 -12.9837395 0.224693658 76.268455 1152.28 0.232943139 75.7965659 0.969510232 -13.4692822 0.969510232 -13.4692822 0.232943139 75.7965659 1194.92 0.24115193 75.3253219 0.967456462 -13.9534101 0.967456462 -13.9534101 0.24115193 75.3253219 1237.56 0.249318907 74.8548296 0.965340883 -14.4360826 0.965340883 -14.4360826 0.249318907 74.8548296 1280.2 0.257442976 74.3851868 0.963164388 -14.9172601 0.963164388 -14.9172601 0.257442976 74.3851868 1322.84 0.265523079 73.9164837 0.960927894 -15.3969035 0.960927894 -15.3969035 0.265523079 73.9164837 1365.48 0.273558187 73.4488039 0.958632338 -15.874975 0.958632338 -15.874975 0.273558187 73.4488039 1408.12 0.281547305 72.9822253 0.956278677 -16.3514376 0.956278677 -16.3514376 0.281547305 72.9822253 1450.76 0.289489473 72.5168204 0.953867884 -16.826255 0.953867884 -16.826255 0.289489473 72.5168204 1493.4 0.297383762 72.0526573 0.951400952 -17.2993922 0.951400952 -17.2993922 0.297383762 72.0526573 1536.04 0.305229279 71.5897996 0.948878884 -17.7708149 0.948878884 -17.7708149 0.305229279 71.5897996 1578.68 0.313025164 71.1283073 0.9463027 -18.2404899 0.9463027 -18.2404899 0.313025164 71.1283073 1621.32 0.320770591 70.6682369 0.943673432 -18.7083849 0.943673432 -18.7083849 0.320770591 70.6682369 1663.96 0.32846477 70.2096417 0.940992122 -19.1744686 0.940992122 -19.1744686 0.32846477 70.2096417 1706.6 0.336106942 69.7525719 0.938259823 -19.6387107 0.938259823 -19.6387107 0.336106942 69.7525719 1749.24 0.343696386 69.2970752 0.935477594 -20.1010817 0.935477594 -20.1010817 0.343696386 69.2970752 1791.88 0.351232411 68.8431965 0.932646504 -20.5615535 0.932646504 -20.5615535 0.351232411 68.8431965 1834.52 0.358714364 68.3909787 0.929767627 -21.0200986 0.929767627 -21.0200986 0.358714364 68.3909787 1877.16 0.366141623 67.940462 0.926842043 -21.4766906 0.926842043 -21.4766906 0.366141623 67.940462 1919.8 0.373513602 67.4916849 0.923870834 -21.9313042 0.923870834 -21.9313042 0.373513602 67.4916849 1962.44 0.380829746 67.0446835 0.920855087 -22.383915 0.920855087 -22.383915 0.380829746 67.0446835 2005.08 0.388089534 66.5994923 0.917795889 -22.8344995 0.917795889 -22.8344995 0.388089534 66.5994923 2047.72 0.395292479 66.1561438 0.91469433 -23.2830353 0.91469433 -23.2830353 0.395292479 66.1561438 2090.36 0.402438125 65.714669 0.911551497 -23.729501 0.911551497 -23.729501 0.402438125 65.714669 2133 0.40952605 65.2750971 0.908368478 -24.1738761 0.908368478 -24.1738761 0.40952605 65.2750971 2175.64 0.41655586 64.8374555 0.90514636 -24.6161409 0.90514636 -24.6161409 0.41655586 64.8374555 2218.28 0.423527197 64.4017706 0.901886224 -25.056277 0.901886224 -25.056277 0.423527197 64.4017706 2260.92 0.43043973 63.9680668 0.89858915 -25.4942667 0.89858915 -25.4942667 0.43043973 63.9680668 2303.56 0.43729316 63.5363674 0.895256212 -25.9300933 0.895256212 -25.9300933 0.43729316 63.5363674 2346.2 0.444087217 63.1066943 0.89188848 -26.363741 0.89188848 -26.363741 0.444087217 63.1066943 2388.84 0.450821661 62.6790679 0.888487016 -26.7951949 0.888487016 -26.7951949 0.450821661 62.6790679 2431.48 0.457496281 62.2535076 0.885052878 -27.2244411 0.885052878 -27.2244411 0.457496281 62.2535076 2474.12 0.464110893 61.8300313 0.881587114 -27.6514665 0.881587114 -27.6514665 0.464110893 61.8300313 2516.76 0.470665341 61.4086558 0.878090766 -28.0762589 0.878090766 -28.0762589 0.470665341 61.4086558 2559.4 0.477159496 60.9893969 0.874564865 -28.4988069 0.874564865 -28.4988069 0.477159496 60.9893969 2602.04 0.483593256 60.5722691 0.871010434 -28.9191001 0.871010434 -28.9191001 0.483593256 60.5722691 2644.68 0.489966542 60.1572859 0.867428488 -29.3371287 0.867428488 -29.3371287 0.489966542 60.1572859 2687.32 0.496279303 59.7444596 0.863820029 -29.7528841 0.863820029 -29.7528841 0.496279303 59.7444596 2729.96 0.502531512 59.3338016 0.860186049 -30.166358 0.860186049 -30.166358 0.502531512 59.3338016 2772.6 0.508723164 58.9253223 0.856527528 -30.5775433 0.856527528 -30.5775433 0.508723164 58.9253223 2815.24 0.514854279 58.5190312 0.852845437 -30.9864335 0.852845437 -30.9864335 0.514854279 58.5190312 2857.88 0.520924898 58.1149367 0.849140731 -31.393023 0.849140731 -31.393023 0.520924898 58.1149367 2900.52 0.526935085 57.7130463 0.845414356 -31.7973066 0.845414356 -31.7973066 0.526935084 57.7130463 2943.16 0.532884923 57.3133669 0.841667242 -32.1992802 0.841667242 -32.1992802 0.532884923 57.3133669 2985.8 0.538774518 56.9159041 0.837900309 -32.5989403 0.837900309 -32.5989403 0.538774518 56.9159041 3028.44 0.544603995 56.5206631 0.834114462 -32.996284 0.834114462 -32.996284 0.544603995 56.5206631 3071.08 0.550373497 56.127648 0.830310591 -33.3913091 0.830310591 -33.3913091 0.550373497 56.127648 3113.72 0.556083186 55.7368622 0.826489575 -33.7840141 0.826489575 -33.7840141 0.556083186 55.7368622 3156.36 0.561733242 55.3483084 0.822652276 -34.1743981 0.822652276 -34.1743981 0.561733242 55.3483084 3199 0.567323863 54.9619886 0.818799543 -34.562461 0.818799543 -34.562461 0.567323863 54.9619886 3241.64 0.57285526 54.577904 0.814932211 -34.948203 0.814932211 -34.948203 0.57285526 54.577904 3284.28 0.578327665 54.1960551 0.811051099 -35.3316252 0.811051099 -35.3316252 0.578327665 54.1960551 3326.92 0.583741321 53.8164418 0.807157013 -35.712729 0.807157013 -35.712729 0.583741321 53.8164418 3369.56 0.589096487 53.4390633 0.803250743 -36.0915165 0.803250743 -36.0915165 0.589096487 53.4390633 3412.2 0.594393436 53.0639182 0.799333063 -36.4679903 0.799333063 -36.4679903 0.594393436 53.0639182 3454.84 0.599632455 52.6910046 0.795404734 -36.8421537 0.795404734 -36.8421537 0.599632455 52.6910046 3497.48 0.604813842 52.3203198 0.7914665 -37.2140101 0.7914665 -37.2140101 0.604813842 52.3203198 3540.12 0.609937909 51.9518608 0.787519093 -37.5835638 0.787519093 -37.5835638 0.609937909 51.9518608 3582.76 0.615004978 51.5856239 0.783563226 -37.9508194 0.783563226 -37.9508194 0.615004978 51.5856239 3625.4 0.620015383 51.2216049 0.779599599 -38.315782 0.779599599 -38.315782 0.620015383 51.2216049 3668.04 0.624969468 50.8597991 0.775628897 -38.678457 0.775628897 -38.678457 0.624969468 50.8597991 3710.68 0.629867587 50.5002014 0.77165179 -39.0388504 0.77165179 -39.0388504 0.629867587 50.5002014 3753.32 0.634710104 50.142806 0.767668933 -39.3969686 0.767668933 -39.3969686 0.634710104 50.142806 3795.96 0.63949739 49.7876069 0.763680965 -39.7528182 0.763680965 -39.7528182 0.63949739 49.7876069 3838.6 0.644229825 49.4345977 0.759688511 -40.1064064 0.759688511 -40.1064064 0.644229825 49.4345977 3881.24 0.648907799 49.0837713 0.755692182 -40.4577406 0.755692182 -40.4577406 0.648907799 49.0837713 3923.88 0.653531706 48.7351205 0.751692573 -40.8068288 0.751692573 -40.8068288 0.653531706 48.7351205 3966.52 0.658101948 48.3886375 0.747690265 -41.153679 0.747690265 -41.153679 0.658101948 48.3886375 4009.16 0.662618936 48.0443143 0.743685826 -41.4982997 0.743685826 -41.4982997 0.662618936 48.0443143 4051.8 0.667083082 47.7021426 0.739679806 -41.8406998 0.739679806 -41.8406998 0.667083082 47.7021426 4094.44 0.671494807 47.3621134 0.735672746 -42.1808883 0.735672746 -42.1808883 0.671494807 47.3621134 4137.08 0.675854537 47.0242178 0.731665169 -42.5188745 0.731665169 -42.5188745 0.675854537 47.0242178 4179.72 0.6801627 46.6884465 0.727657585 -42.8546682 0.727657585 -42.8546682 0.6801627 46.6884465 4222.36 0.684419732 46.3547897 0.723650491 -43.1882791 0.723650491 -43.1882791 0.684419732 46.3547897 4265 0.68862607 46.0232376 0.719644371 -43.5197174 0.719644371 -43.5197174 0.68862607 46.0232376 4307.64 0.692782155 45.6937799 0.715639695 -43.8489935 0.715639695 -43.8489935 0.692782155 45.6937799 4350.28 0.696888431 45.3664062 0.71163692 -44.1761178 0.71163692 -44.1761178 0.696888431 45.3664062 4392.92 0.700945347 45.0411059 0.707636489 -44.5011012 0.707636489 -44.5011012 0.700945347 45.0411059 4435.56 0.70495335 44.717868 0.703638834 -44.8239546 0.703638834 -44.8239546 0.70495335 44.717868 4478.2 0.708912895 44.3966815 0.699644372 -45.1446892 0.699644372 -45.1446892 0.708912895 44.3966815 4520.84 0.712824432 44.077535 0.695653511 -45.4633162 0.695653511 -45.4633162 0.712824432 44.077535 4563.48 0.716688419 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0.0589770148 72.2844446 0.0589770148 72.2844446 0.983659421 -3.27414578 17057 0.983507519 -3.36178398 0.0604724259 72.499475 0.0604724259 72.499475 0.983507519 -3.36178398 17099.64 0.98335338 -3.44919427 0.0619654883 72.6990835 0.0619654883 72.6990835 0.98335338 -3.44919427 17100 0.983352069 -3.44993129 0.0619780836 72.7007065 0.0619780836 72.7007065 0.983352069 -3.44993129 ---------- s2.py ---------- import sys, os from os.path import splitext from math import log10 class s2spice: "convert S2P tables to PSpice-compatible frequency-response tables" USAGE = """ WBA 7/94. Translated to ActiveState Python 2.2 by |
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Re: monolithic mosfet
--- In LTspice@..., Panama Mike <panamatex@y...> wrote:
Norbert,Mike,Please take a look at twomos.asc and twonorbs.asc, andOh, yes, now I see what you're trying to do. Yes, the Thanks for your help. I'm just pleased to have the clear and straightforward schematic entry with SWcad. And with a way of passing parameters down the hierarchy I can model other component parasitics too. Regards, Norbert. |
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Re: monolithic mosfet
Norbert,
Please take a look at twomos.asc and twonorbs.asc, andOh, yes, now I see what you're trying to do. Yes, the only supported way you have to scope math to an instance is with a subcircuit. (LTspice can scope math to a symbol when used to read special schematic databases used in-house. But it's such a terrible system that I can't release it in clear conscience for public use. Perhaps some day I will do that after I add a mode to the attribute compiler that removes some of it's more objectionable behavior that's required to be compatible with other CAD tools used here.) In the meanwhile, I guess I have to recommend to stick to your workaround if you want areas and perimeters computed from instance lengths and widths and global process parameters. --Mike __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. |
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Re: monolithic mosfet
Mike,
It does help to see the schematics! Please take a look at twomos.asc and twonorbs.asc, and how the parameterization works, and how AD is calculated as an example. In twomos.asc, the L and W of each mosdevice come from .params L1 W1 L2 W2, and the area calculation is entered on the "Monolitic Mosfet" parameter menu. In twonorbs.asc the L and W are entered on the "Schematic Edit Block" menu, and the area calculation is done in the subcircuit for the norbmos4 block. Regards, Norbert. --twomos.asc-- Version 4 SHEET 1 880 680 WIRE -16 304 64 304 WIRE 336 288 336 304 WIRE 336 304 384 304 WIRE -64 288 -64 304 WIRE -64 304 -16 304 WIRE -16 256 64 256 WIRE 64 256 64 304 WIRE 64 304 80 304 WIRE 384 256 464 256 WIRE 464 256 464 304 WIRE 80 304 80 384 WIRE 80 304 208 304 WIRE 384 304 464 304 WIRE 208 304 208 240 WIRE 208 304 336 304 WIRE 208 160 -16 160 WIRE -16 160 -16 208 WIRE 208 160 384 160 WIRE 384 160 384 208 FLAG 80 384 0 SYMBOL nmos4 -64 208 R0 WINDOW 123 56 100 Left 0 SYMATTR Value2 l={L1} w={W1} ad={W1*LDIF} SYMATTR InstName M1 SYMBOL nmos4 336 208 R0 WINDOW 123 56 100 Left 0 SYMATTR Value2 l={L2} w={W2} ad={W2*LDIF} SYMATTR InstName M2 SYMBOL voltage 208 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 0 TEXT 176 376 Left 0 !.param L1=1u TEXT 176 408 Left 0 !.param W1=10u TEXT 176 440 Left 0 !.param L2=5u TEXT 176 472 Left 0 !.param W2=20u TEXT 176 504 Left 0 !.param LDIF=1u TEXT 176 352 Left 0 !.op --twonorbs.asc-- Version 4 SHEET 1 880 680 WIRE -64 304 -16 304 WIRE 336 288 336 304 WIRE 336 304 384 304 WIRE -64 288 -64 304 WIRE -16 256 64 256 WIRE 64 256 64 304 WIRE 64 304 80 304 WIRE 384 256 464 256 WIRE 464 256 464 304 WIRE 80 304 80 384 WIRE 80 304 208 304 WIRE 208 304 208 240 WIRE 208 304 336 304 WIRE 208 160 -16 160 WIRE -16 160 -16 208 WIRE 208 160 384 160 WIRE 384 160 384 208 WIRE -16 304 64 304 WIRE 384 304 464 304 FLAG 80 384 0 SYMBOL voltage 208 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 0 SYMBOL C:\Program\ Files\LTC\SwCADIII\norbmos4 -64 208 R0 WINDOW 39 56 60 Left 0 SYMATTR InstName X1 SYMATTR SpiceLine L=1u W=10u M=1 SYMBOL C:\Program\ Files\LTC\SwCADIII\norbmos4 336 208 R0 WINDOW 39 56 60 Left 0 SYMATTR InstName X2 SYMATTR SpiceLine L=5u W=20u M=1 TEXT 176 392 Left 0 !.param LDIF=1u TEXT 176 352 Left 0 !.op --norbmos4.asc-- Version 4 SHEET 1 1084 680 WIRE 80 192 80 128 WIRE 80 240 144 240 WIRE 80 288 80 368 WIRE 32 272 -32 272 FLAG 80 368 S FLAG -32 272 G FLAG 144 240 B FLAG 80 128 D SYMBOL nmos4 32 192 R0 WINDOW 123 56 100 Left 0 SYMATTR Value2 l={L} w={W} ad={LDIF*W} as={LDIF*W} m={M} SYMATTR InstName M1 --norbmos4.asy-- Version 4 SymbolType BLOCK LINE Normal 48 80 48 96 LINE Normal 16 80 48 80 LINE Normal 40 48 48 48 LINE Normal 16 48 40 44 LINE Normal 16 48 40 52 LINE Normal 40 44 40 52 LINE Normal 16 8 16 24 LINE Normal 16 40 16 56 LINE Normal 16 72 16 88 LINE Normal 0 80 8 80 LINE Normal 8 16 8 80 LINE Normal 48 16 16 16 LINE Normal 48 0 48 16 WINDOW 0 56 32 Left 0 WINDOW 3 56 72 Left 0 PIN 48 0 NONE 0 PINATTR PinName D PINATTR SpiceOrder 1 PIN 0 80 NONE 0 PINATTR PinName G PINATTR SpiceOrder 2 PIN 48 96 NONE 0 PINATTR PinName S PINATTR SpiceOrder 3 PIN 48 48 NONE 0 PINATTR PinName B PINATTR SpiceOrder 4 --twomos.net-- * C:\Program Files\LTC\SwCADIII\twomos.asc M1 N001 0 0 0 NMOS l={L1} w={W1} ad={W1*LDIF} M2 N001 0 0 0 NMOS l={L2} w={W2} ad={W2*LDIF} V1 N001 0 0 .model NMOS NMOS .model PMOS PMOS .lib C:\PROGRAM FILES\LTC\SWCADIII\lib\cmp\standard.mos .param L1=1u .param W1=10u .param L2=5u .param W2=20u .param LDIF=1u .op .backanno .end --twonorbs.net-- * C:\Program Files\LTC\SwCADIII\twonorbs.asc V1 N001 0 0 X1 N001 0 0 0 norbmos4 params: L=1u W=10u M=1 X2 N001 0 0 0 norbmos4 params: L=5u W=20u M=1 * block symbol definitions .subckt norbmos4 D G S B M1 D G S B NMOS l={L} w={W} ad={LDIF*W} as={LDIF*W} m={M} .ends norbmos4 .model NMOS NMOS .model PMOS PMOS .lib C:\PROGRAM FILES\LTC\SWCADIII\lib\cmp\standard.mos .param LDIF=1u .op .backanno .end |
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Re: Personal Problem to Link OpAmp with SubCircuit
--- In LTspice@..., "Helmut Sennewald"
<helmutsennewald@y...> wrote: --- In LTspice@..., <Bernhard_Kraemer@w...> wrote:TL071.Hello, toFor that, I drawed a new symbol: TL071.asywhich can be found in the directory C:\Programme\LTSpice\lib\sub\. work.ModelThe error message tells:where the TL071 subcircuit is saved. But I don't know no way to to work?Sorry, the order of my instructions may be misleading. It should be that way: Make a copy of the LT1013.asy -> TL071.asy Replace the obvious text LT1013 with TL071. Replace the text ltc.lib with your library name, e.g. ti.lib. Save the symbol file tl071.asy. Move your library file, ti.lib in this case, into the folder sub. Hint: You can put as many models as you want into this library file. Then restart LTSPICE. Best Regards Helmut |
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Re: monolithic mosfet
Norbert,
Thanks Mike, that does work - but then theI don't think I understand. Attached is circuit that scales two mosfets by one parameter. --Mike --- snip.asc --- Version 4 SHEET 1 880 680 WIRE 32 240 112 240 WIRE 320 240 368 240 WIRE 224 320 224 288 WIRE 224 208 224 160 WIRE 224 160 368 160 WIRE 368 160 368 192 WIRE 368 288 368 320 WIRE 32 320 32 288 WIRE 32 192 32 160 WIRE 32 160 224 160 WIRE -112 464 -112 432 WIRE -112 352 -112 272 WIRE -16 272 -112 272 WIRE -112 272 -112 112 WIRE -112 112 448 112 WIRE 448 112 448 272 WIRE 448 272 416 272 FLAG 112 240 0 FLAG 320 240 0 FLAG 368 320 0 FLAG 32 320 0 FLAG 224 320 0 FLAG -112 464 0 SYMBOL nmos4 -16 192 R0 WINDOW 123 56 100 Left 0 SYMATTR InstName M1 SYMATTR Value2 L={L} SYMBOL nmos4 416 192 M0 WINDOW 123 56 100 Left 0 SYMATTR InstName M2 SYMATTR Value2 L={2*L} SYMBOL voltage 224 192 R0 SYMATTR InstName V1 SYMATTR Value 0 SYMBOL voltage -112 336 R0 SYMATTR InstName V2 SYMATTR Value 0 TEXT 120 392 Left 0 !.param L=10u TEXT 96 472 Left 0 !.dc V1 0 3 1m V2 0 3 1 __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. |
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Re: Personal Problem to Link OpAmp with SubCircuit
--- In LTspice@..., <Bernhard_Kraemer@w...> wrote:
Hello,which can be found in the directory C:\Programme\LTSpice\lib\sub\. In the file TL071.lib, I saved the subcircuit like this:work. The error message tells:where the TL071 subcircuit is saved. But I don't know no way to define a library in a schematics file. to work? Hello Bernhard, have you really drawn it new? Just make a copy of the LT1013.asy -> TL071.asy Replace the obvious LT1013 with TL071. Then restart LTSPICE. Replace the ltc.lib with your ti.lib. You can put as many models you want into this library file. Best Regards Helmut The adapted LT1013.asy file: Version 4 SymbolType CELL LINE Normal -32 32 32 64 LINE Normal -32 96 32 64 LINE Normal -32 32 -32 96 LINE Normal -28 48 -20 48 LINE Normal -28 80 -20 80 LINE Normal -24 84 -24 76 LINE Normal 0 32 0 48 LINE Normal 0 96 0 80 LINE Normal 4 44 12 44 LINE Normal 8 40 8 48 LINE Normal 4 84 12 84 WINDOW 0 16 32 Left 0 WINDOW 3 16 96 Left 0 SYMATTR Value TL071 SYMATTR Prefix X SYMATTR SpiceModel TI.lib SYMATTR Value2 TL071 SYMATTR Description Single Precision Operational Amplifier PIN -32 80 NONE 0 PINATTR PinName In+ PINATTR SpiceOrder 1 PIN -32 48 NONE 0 PINATTR PinName In- PINATTR SpiceOrder 2 PIN 0 32 NONE 0 PINATTR PinName V+ PINATTR SpiceOrder 3 PIN 0 96 NONE 0 PINATTR PinName V- PINATTR SpiceOrder 4 PIN 32 64 NONE 0 PINATTR PinName OUT PINATTR SpiceOrder 5 |
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Personal Problem to Link OpAmp with SubCircuit
Hello,
I have a problem with new symbol designing! I'd like to design a simple amplifier circuit with the OpAmp TL071. For that, I drawed a new symbol: TL071.asy I set the attribute "Prefix : X" I also set the attribute "SpiceModel" to the filename TL071.lib, which can be found in the directory C:\Programme\LTSpice\lib\sub\. In the file TL071.lib, I saved the subcircuit like this: .SUBCKT TL071 1 2 3 4 5 C1 11 12 3.498E-12 C2 6 7 15.00E-12 DC 5 53 DX and so on... Unfortunately, I don't get no circuit with the so-defined TL071 to work. The error message tells: "Error: Unknown device type in: xu1 n004 n001 n002 0 n002 tl071" I think, it is because I didn't clearly define the library file where the TL071 subcircuit is saved. But I don't know no way to define a library in a schematics file. What could I do to get my circuit with my self-designed OpAmp-Model to work? Sincerely Yours, Bernhard ______________________________________________________________________________ UNICEF bittet um Spenden f¨¹r die Kinder im Irak! Hier online an UNICEF spenden: |
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Re: monolithic mosfet
--- In LTspice@..., Panama Mike <panamatex@y...> wrote:
Norbert,theIf I were placing a MOSFET e.g. W=5u L=0.5u , and the length of MOSFET"source and drain implants might be LS=1u LD=1u. LS,LD could be popup attribute menu, but I can't pick up the device W for theYes. There's three ways to do it. Thanks Mike, that does work - but then the parameterization is valid only for the 1 instance. Every instance of the MOSFET symbol would need its own .PARAM statement, and the maths entered manually. In the end, the only way I could achieve what I wanted was to copy the 'nmos4' MOSFET symbol, and make it a hierarchical block 'norbmos4' I then created a schematic 'norbmos4' for the new symbol, instantiated an 'nmos4' in it with {L} {W} {M} for L W M and e.g. {LDIF*W} for AD etc. Now I can instantiate any number of 'norbmos4' devices, add PARAMS 'W=10u L=0.5u M=5' to this schematic block, and one .PARAM LDIF=1u directive. All I can say at the moment is that this netlists,and the simulator doesn't complain - whether it works or not for simulation I don't know yet. The downside is that every NMOS device on my schematic is now a 'norbmos' subcircuit containing an 'nmos4'. The upside is that the typical parasitics should be calculated for me. On to my second day of using LTSpice .... looks good so far! Regards, Norbert. |
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Re: monolithic mosfet
Norbert,
If I were placing a MOSFET e.g. W=5u L=0.5u , and the length of theYes. There's three ways to do it. i) If using the nmos4 symbol you get the "Monolithic MOSFET" dialog box. For length, type in {L}. And then place a SPICE directive on the schematic such as .param L=10u or ".step param L list 5u 7u 8u" ii) How down the control key and right click on the body. Enter L={L} on one of the attributes, SpiceModel, Value, Value2, SpiceLine or SpiceLine2. These attribute names mean nothing. Their values are concatenated for the netlist. iii) Move the mouse to the value of the MOSFET and right click. Edit it to be something like "NM L={L} W={W}" --Mike __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. |
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monolithic mosfet
If I were placing a MOSFET e.g. W=5u L=0.5u , and the length of the
source and drain implants might be LS=1u LD=1u. LS,LD could be defined with a .PARAM spice directive. In some netlisters, the parameters AD AD PD PS NRS NRD can be calculated automatically, e.g. AD=W*LD PD=2*LD+2*W NRS=LD/W. Can the LTSpice netlister do this? I can set .PARAM LD=1u, and I can use it in the "Monolithic MOSFET" popup attribute menu, but I can't pick up the device W for the equation {W*LD} to enter in the AD box. Regards, Norbert |
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Re: Publications Dealing with Circuit Simulation & Spice?
Dale,
What are some good magazines or journals to watch for infoI don't know that there's much published in magazines/journals. Worldwide, there's very few people who work on SPICE internals these days. Books a largely a better source. I really like the 2nd Edition of _Semiconductor Device Modeling with SPICE_ by Giuseppe Massobrio and Paolo Antognetti. --Mike __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. |
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Re: setting default Trise and Tfall for special function models
--- In LTspice@..., "Rose, Michael (Michael)"
<mrose2@a...> wrote: I just wanted to pass along a little tip when using DFLOP specialfunction models. The rise and fall times default to 0 which will cause incorrect switching when the flops are cascaded. You have to add a Trise=xx value to the flop's Spiceline. According to the help, Tfall will default to specified Trise so does not need to be explicitly specified. Hopefully this might help save a bit of head- sratching . Hello Michael, I always prefer to specify a delay time for each D-flipflop or any other digital gate. I don't think that Tr and Tf are necessary if you already have specified Td. Example: Td=1ns Best Regards Helmut |
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setting default Trise and Tfall for special function models
Rose, Michael (Michael)
¿ªÔÆÌåÓýI just
wanted to pass along a little tip when using DFLOP special function models. The
rise and fall times default to 0 which will cause incorrect switching when the
flops are cascaded. You have to add a?Trise=xx value?to the flop's
Spiceline. According to the help, Tfall will default to specified Trise so does
not need to be explicitly specified. Hopefully this might help save a bit of
head-sratching.
?
Mike |
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Re: A question about the modeling in LT Spice -- results <> theory?
--- In LTspice@..., Jonathan Kirwan <jkirwan@e...> wrote:
On Wed, 30 Apr 2003 19:41:15 -0000, you wrote:believeI tried my own math to get a new formula, because I couldn't Hello Jon,that your formula is correct.As I said, it seemed a little strange to me, too.Assume that your period is very long compared to the time Ton.No need for assumptions. Let's just do the math. Back to the be aware that this VnodeMEAN is not the necessary the average of the signal. It is the middle between the two peaks. I was too lazy to follow the whole math. If you put your Vp=V into my formula it would look like ton = R*C*dI/I Your factor ln((2-x)/(2+x)) can be very good approximted by ln((2-x)/(2+x)) = -x Even for x = 0.5, the error is only 2%. If I apply that to your formula, I will get: ton = R*C*dI/I So both formulas are very equal. Thanks for your exact calculation. Best Regards Helmut |
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Arnold Esper
Hello Steve,
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thanks for this fine example of using the rand-function. Arnold * * Mike, I found your use of the RAND function for Monte Carlo a very |
Mike Engelhardt
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