LTSpice - How to copy schematic and get a quality image Cut and paste of a pdf image still gives a rasterized representation (e.g.gif or.png). That can be scaled later on, you need to convert pdf to e.g. Wmf with a graphics tool. To a portable postscript (eps or ai) format. 1 members found this post helpful. No need to add a directory. LTspice will find it if the file is in the same folder with the schematic it is working on. If you use the ModelFile attribute, again do not include a directory. Just the file name for the.CIR file. (Include the extension,.CIR, though.) LTspice will find the model file, as well.
Attached are the results of a well-known SPICEbenchmark that I found on the Intusoft website.I was interested to see where NGSPICE is inrespect to other simulators. We are not doingbad at all:-)Note 1: LTspice was ordered to use itsalternate solver (1.5 times slower thanthe normal solver). The results for thenormal solver were not always believable.I set the nomarch option for LTspicebecause marching waveforms can be costly.Note 2: This is the MCNC benchmark suiteas downloaded from the Intusoft pages,NOT the one from the LTspice Yahoo filearea (which appears to be slightly different).Note 3: I removed as many options aspossible. Neither LTspice nor NGSPICEbenefitted much from them. LTspice isoptimized for the TRAP method, whileNGSPICE generally worked better withGEAR.
When limiting the step sizeseemed needed, reltol was decreased instead.Note 4: For small circuits the simulationtimes are insignificant. For the biggercircuits LTspice seems to progressivelyget more into trouble, and couldn't evenrun a few of the examples (or tried to runthem too well).
It might be possible tomake the circuits work everywhere bytweaking.OPTIONS, but comparisons wouldhave become rather meaningless.Note 5: Although LTspice puts up animpressive show with all the i7's 6 coresrunning at 100%, not much advantage of thisbehavior can be detected from the results(NGSPICE used at most 2 cores).Note 6: The MCNC suite uses MOS level 2and 3, not the much better behaved level 8.Note 7: Neither LTspice nor NGSPICE couldrun the pcframe benchmark.This circuit seems to use non-standardfeatures (of Intusoft?)-marcel.
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LTSpice Hierachy block can not be found if it is not in current working directory.I am using this tutorial to create sub-circuits in LTSpice:Everything is fine except that the sub-circuit that I make can not be used globally. Every time that I have a new design I must copy my sub-circuits to the directory that my top-level design resides.I even moved my sub-circuit (both.asc and.asy files) into a folder under E:Program Files (x86)LTCLTspiceIVlibsym but LTSpice can not find it. Alright, I found a workaround by myself that works!1) Design your circuit in LTSpice and name all nets that will be connect to outside world. Save the circuit in.asc format in a subfolder under E:Program Files (x86)LTCLTspiceIVlibsym. Like this:2) Before leaving the schematic editor go to View - SPICE Netlist. Copy and paste the netlist into a lib file, let's say 'mysubcir.lib'. Add a line above the pasted netlist to define a subcircuit like this:mysubcir.lib:.subckt inverter0351 in out VDD GND.
Add this line, inverter0351 must match the.asy filename. E:Program Files (x86)LTCLTspiceIVlibsym5827inverter0351.ascXM1 out in 0 0 NM W=1u L=0.35uXM2 out in VDD VDD PM W=3u L=0.35u.end inverter0351. you need to add this also3) Go to File - New Symbol and design your symbol. Put the pins with same net names in your schematic, in this case we have four pins: 'in out VGD GND'. And then save the.asy file in the same folder that you saved.asc file. Like this:Now your new subcircuit is available globally. You only need to add '.lib mysubcir.lib' to your top schematic.The only problem with this approach is that whenever you update the.asc file then you have to export the netlist and copy/paste it again into the.lib file.
Any other solution that avoids this double rework is very welcome.