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How do I import the LMH6629 spice file into LTSpice IV?
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Hi all,
I hope you can help with this as I'd like to try out an inspiration I got... But to do so I need to import the LMH6629 opamp spice file into LTSpice. I've tried to do so using a regular opamp symbol as the model but LTSpice reports an error saying that the instances are not identical. So I reckon the LMH6629 functionality doesn't exactly match LTSpice's regular opamp model. Could it be that one of you know how to do this? The LMH6629's spice model can be found here: Best regards, Jesper |
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--- In LTspice@..., "Jesper" <irpheus@...> wrote:
Hello Jesper, You should always look into the model file (.mod) when you start with a new model. * PINOUT ORDER +IN -IN +V -V OUT COMP * PINOUT ORDER 4 3 8 5 7 6 .SUBCKT LMH6629 4 3 8 5 7 6 It has the same pin-order as the "opamp2". The only difference is the 6th pin. Simply add one pin to the "opamp2" symbol and set the netlist order of this pin to 6. Save this modified symbol with a new name in your design folder. Best regards, Helmut |
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--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
Hello Jesper, There is already an example in our Files-section. Files > Lib > LMH6629_test.zip Best regards, Helmut |
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Hi Helmut,
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Thanks for such a swift reply and helpful reply ;-) I'll look into it and see if I can get it to work. Greetings, Jesper --- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
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Hi again, Helmut.
I've now tried to download the files from the link you gave but I reckon I need to step back a bit and understand more basically how I associate a model (within LTSpice's schematic section) with a symbol - as I guess that this is the issue. What I have done is that I: 1. Have added a spice directive .include with the exact file name of the lmh6629.mod file that I downloaded from this group's file directory.2. I have saved the lmh6629.mod file in the same directory as the lmh6629.asc file.3. I have also saved the symbol file xopamp_c1.asy in the same directory as the lmh6629.asc file4. I have changed the "value" in the "Component Attribute Editor" dialog to "LMH6629". The "Prefix" is "X". Still, when I run the simulation I again get an "instance" message saying: " The instance has fewer connection terminals than the definition". Can you help me with which steps I am missing and where/how to set them up? Many regards, Jesper --- In LTspice@..., "Jesper" wrote:>> Hi Helmut,> > Thanks for such a swift reply and helpful reply ;-) I'll look into it and see if I can get it to work.> > Greetings,> > Jesper > > --- In LTspice@..., "Helmut" wrote:> >> > > > > > --- In LTspice@..., "Helmut" wrote:> > >> > > > > > > > > --- In LTspice@..., "Jesper" wrote:> > > >> > > > Hi all,> > > > > inspiration I got... > > > > > > > > But to do so I need to import theI hope you can help with this as I'd like to try out an LMH6629 opamp spice file into LTSpice. I've tried to do so using a regular opamp symbol as the model but LTSpice reports an error saying that the instances are not identical. So I reckon the LMH6629 functionality doesn't exactly match LTSpice's regular opamp model.> > > spice model can be found here:> > > > > > > >Could it be that one of you know how to do this? The LMH6629's ; om133&fileType=zip> > > > > > > > Best regards,> > > > > > > > Jesper> > into the model file (.mod) when you> > > start with a new model.> > > >Hello Jesper,> > > > > > You should always look 5 7 6> > > .SUBCKT LMH6629 4 3 8 5 7 6> > > > > > It has the same* PINOUT ORDER +IN -IN +V -V OUT COMP> > > * PINOUT ORDER 4 3 8 pin-order as the "opamp2". The only difference> > > is the 6th pin. Simply add one pin to the "opamp2" symbol and> > > set the netlist order of this pin to 6. Save this modified > > > symbol with a new name in your design folder.> > > > > > Best regards,> > > Helmut> > >> > > > Hello Jesper,> > > > There is already an example in our Files-section.> > > > > BestFiles > Lib > LMH6629_test.zip> > > > regards,> > Helmut |
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--- In LTspice@..., "Jesper" <irpheus@...> wrote:
Hello Jesper, Sorry, I had forgotten to include a schematic in my original file LMH6629_test.zip. I have now uploaded a new zip-file with two examples. 1. Using symbol LMH6629.asy 2. Using symbol xopamp_c1.asy The first example has the filename in the symbol attributes. Thus it doesn't need a .lib or .inc command in the schematic. Files > Lib > LMH6629_test.zip Best regards, Helmut |
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Hi again Helmut,
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& thanks for uploading the new files :-) Incidentally, you've actually helped me with a challenge I've had on how to make a tiny circuitry to measure HF noise in DAC/ADC supply rails: With a few modifications it looks as if the circuitry you've drawn up can be used for this ... Thank you! However, to be honest I still don't understand/know how the "complete" import of a component with a different pin layout and/or a new symbol is done. Might you be able to point me to a description of this - maybe here in this forum - that describes this for a sort of newbie, i.e. in an intuitive way and maybe step by step? I've been using LTSpice for some years now and know how to perform some setups and analyses but sometimes still need to take things step by step. Also, I am looking for an LTspice/spice model of one of those lamps that are used in oscillator designs to adjust the AGC of the feedback loop. I've searched the files here and found some but am unsure which one to use. I'm considering building an oscillator similar to the one shown in the LT1007 spec sheet (ultrapure sinewave oscillator): but at a higher frequency (1 - 10 MHz if possible). Would you off the bat know which of the lamp files to use? Once again, thanks for your previous help, Helmut. And BTW if the simulations LMH6629 simulations are realistic it looks as if it's a quite well-designed component - not easy to make unstable. Impressive actually ... Greetings, Jesper --- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
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Hello Jesper,
However, to be honest I still don't understand/know how theMy examples are for a universal symbol and a specific symbol. Please open the symbol files(.asy) with the symbol editor of LTspice and view the obvious differences in the attributes of both symbols. Edit -> Attributes -> Edit Attributes The netlist order in the pins start from 1 and ends with the number of pins of the subcircuit definition. The netlist order will be from 1 to 5 for a .subckt with 5 pins. Best regards, Helmut |
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Hi Helmut,
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Thanks again. I'll take another look at it and see if this time the penny drops :-) Greetings, Jesper --- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
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