Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- LTspice
- Messages
Search
|
Re: No XP?
Gunoi Nare
The free TINA is severely restricted/handicapped. You can not save, print etc files. try it! G
|
|
Re: Probing phase
Steve Kale
¿ªÔÆÌåÓýHi PhilippeI don¡¯t want to labour the point as it is not directly concerned with my outstanding questions regarding phase. However, I do?not?get any errors if the?2SC6144SG?.subckt Spice directive is active (not commented) and all instances of Qd44vh10 are replaced with?2SC6144SG. ?I do not need to ¡°select OK to continue¡±. (This was what I had done when I tested the circuits with the higher fT transistor.) ?If there is any instance of Q44dvh10, then LTspice tells me I have a problem with the lack of a model statement for Q44dvh10 - even though I clearly have one. ?LTspice does not ever tell me there¡¯s a problem with the?2SC6144SG?.subckt Spice directive - not when I have an active instance of the device in the circuit nor when I do. That made finding the problem that much more challenging.? Regards Steve
|
|
Re: exporting large data file from LT spice
John Woodgate
¿ªÔÆÌåÓýEliminate the smaller set of steps and run sims with each step value successively, thus getting you smaller data sets that are more easily interpreted in Excel. Probably takes much less time than trying to interpret a huge 3-domensional data set. ? With best wishes DESIGN IT IN! OOO ¨C Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ? From: LTspice@... [mailto:LTspice@...]
Sent: Wednesday, August 10, 2016 2:45 PM To: LTspice@... Subject: [LTspice] exporting large data file from LT spice ? ? I have a log file that contains stepped input and step temp and is large, when I try to export to excel, I dont know where a data set starts and ends because of the numerous steps etc. Can anyone advise on how best to export the data? |
|
Re: Probing phase
Hello Steve
You wrote : A/ "assuming the pin order is indeed also a problem) " 'llI let others answer you about this point. B/" then, second, LTspice doesn¡¯t have a problem with the .subckt statement when it is invoked but does have a problem with it when it isn¡¯t " I suppose that by "invoked" you mean to say "used" : For me? as soon as there is a not commented command .subckt 2SC6144SG, the subcircuit is invoked even if there is no instance of this part. I don't agree with you : in both cases, as long as subckt 2SC6144SG is not commented, you have an error in subckt 2SC6144SG and LTspice don't want to run. If you choose the option "select OK to continue....." results are not what you are looking for. Morality : I avoid to paste subckt code inside a schematic. Regards PhB |
|
Re: PMBFJ620/2SK2145 or any other dual JFET-models exist for LTspice?
See MCH5908.ZIP in TEMP folder.
toggle quoted message
Show quoted text
Bordodynov. 10.08.2016, 10:59, "'John Woodgate' jmw1937@... [LTspice]" <ltspice@...>: It's in an SIL package, isn't it? You can surface-mount it, but it's rather big and you may have to hand-solder it. |
|
Re: Probing phase
Steve Kale
On 9 Aug 2016, at 19:57, Andy wrote:Ok. "Phase of that one voltage"...Phase of the differential? (Not so intuitive to a newbie.) On 9 Aug 2016, at 20:03, helmut wrote:Ok thanks. So it seems my plots were indeed steps in the right direction. As done they showed the phase difference between that at Vout and each of my selected points in the circuit. I can now amend them to show directly the incremental step in phase as I move around the feedback loop (for example). I just now need to clarify the use of the minus sign ahead of, e.g, V(Vout)/V(Y) where Y is a node label at the minus side of the AC small signal injection point. (See previous comment.) I¡¯ve clearly been getting confused between the graph portraying phase (excluding the op amp's 180 degrees) and phase margin directly. Plus the impact of the minus sign. Of course, in the example I posted, if it is not applied then the graph would read +89 degrees. If it is then the graph reads -91 degrees. It seems odd to talk about a negative margin but Helmut had some time ago told me to plot with the minus sign. I also don¡¯t understand why when I alter both circuits (identically) in Darlington.asc so as to cause a change in the loop gain plot (e.g.extension/contraction of UGF, change in output cap pole leading to greater/lesser loop gain ahead of UGF) there isn¡¯t a complementary change in the line rejection plot (first circuit where AC small signal is added to the supply voltage and output voltage plotted in dB). An example: if I change .param Cout 470u to step this parameter .step param Cout list 470u 220u 100u lower Cout increases loop gain between 100Hz and 100kHz while keeping UGF and phase margin about constant (second circuit) as the pole created by the output cap is moved to higher frequencies. I would expect the greater level of gain being applied at those frequencies by the feedback loop to lead to greater line rejection (modelled by first circuit) at those frequencies. But a plot of output voltage of the first circuit (for which Cout is also stepped) shows no change across the 3 steps. Thanks for all the help Steve |
|
Re: Probing phase
Steve Kale
¿ªÔÆÌåÓýHi PhilippeOK so a weird one. First, On Semi have two errors (assuming the pin order is indeed also a problem) in their Spice model (?) and then, second, LTspice doesn¡¯t have a problem with the .subckt statement when it is invoked but does have a problem with it when it isn¡¯t and when it does have a problem it points to an error unrelated to the .subckt statement. Perhaps one for Mike... Thanks? Steve (back to probing phase)
|
|
Re: No XP?
Gunoi Nare
Andy, Check out TIs TINA.It is no more free but the older version (XPs) is still good enough for me. And it WAS FREE. This is why i am concerned about the? LTC simulator. It spears that Mike will have very soon his own company. Good luck to him. G.
|
|
Re: No XP?
Since ADI took over of LT I had a look at ADI's simulator but it is not compatible with XP so I have tried that tool. I searched for an older version and there does not seem to be an older version on the ADI website. But similarly there does not seem to be older versions of LTspice than IV on LT's website?
By comparison Xlinx do provide some older versions of their free tools for Programmable logic development. It happens that old CAD tools are needed to revisit older work and that means finding and starting up a DOS computer which is often virtually impossible to do. The only option might be to import into a newer tool and hope the conversion works. Which with circuit and PCB design it often does not and their is a lot of work to do if you can not find an old PC and the original program. It has been explained to me on this forum that spice simulation is very interchangeable both to newer or older versions of tools but I also understand the need for the original modelling on the original CAD to be simply repeated. |
|
Re: PMBFJ620/2SK2145 or any other dual JFET-models exist for LTspice?
John Woodgate
¿ªÔÆÌåÓýIt's in an SIL package, isn't it? You can surface-mount it, but it's rather big and you may have to hand-solder it. ? With best wishes DESIGN IT IN! OOO ¨C Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ? From: LTspice@... [mailto:LTspice@...]
Sent: Wednesday, August 10, 2016 8:18 AM To: LTspice@... Subject: [LTspice] Re: PMBFJ620/2SK2145 or any other dual JFET-models exist for LTspice? ? ? Thanks John, It also looks good. (hoping to find a SMD-version of it) Indeed i will design it in if possible. |
|
Re: Looking for a IDT74CBTLV3253 model.
Gunoi Nare
Thanks, this might be it ! G
|
|
Re: PMBFJ620/2SK2145 or any other dual JFET-models exist for LTspice?
Hi Andy,
Yes sorry, i should have been more clear. I did of course google this for days before posting this question. I should have stated clearly that i looked for a SMD-part, and i indeed find results when googling but none of them exist in any shops or as spice models. Strangely. - Rickard |
|
Re: PMBFJ620/2SK2145 or any other dual JFET-models exist for LTspice?
Hi.
toggle quoted message
Show quoted text
That made me a model dual transistor MCH5908. I will elaborate more parameters defining the noise. .model MCH5908 njf Vto=-0.8 BETA=28m BETATCE=-0.5 LAMBDA=20m RD=5 RS=5 CGS=7p CGD=6p PB=1 IS=30f Isr=100p Nr=2 XTI=3 AF=1 Kf=5e-18 Bordodynov. 10.08.2016, 08:43, "§¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó BordodunovAlex@... [LTspice]" <ltspice@...>: I am sorry. |
|
Re: Looking for a IDT74CBTLV3253 model.
PhB wrote: ? ?"I did try to open??directly from my web browser (Firefox) [by open the link in a new ] and I got the error message : multiple instances of "Circle"" Yup.? That is exactly what we expected. ?(Thanks for confirming it.) Gunoi Nare has to make sure he/she does not open it that way.? Then the problem stops. Andy |
|
Re: No XP?
? ?"Why do you think t that? LTspice XVII libraries could not be used with LTspice IV ?" That's what I wondered too. Because the "new library" that comes with LTspiceXVII is (essentially if not exactly) the same as the "old library" that comes with LTspiceIV. However, I think Gunoi Nare is suggesting having Analog Device's models become more compatible with LTspiceIV. This should be a question for Mike Engelhardt, who actually works for LTC and controls LTspice.? Everyone should know how to contact him (see Help -> About LTspiceIV). But it should be mentioned that many of ADI's SPICE models already are compatible with LTspiceIV.? The problem, is that some of them are poorly made or do not work right.? So I suppose the request really was to "fix" ADI's models to make them actually work better or work right.? That would be a tall order (a lot of work for anyone to do). ADI's former Hittite products are in the RF domain where most engineers choose to use other tools and not SPICE.? So there might not be any SPICE models for them.? I don't know why Gunoi Nare singled out Hittite.? ADI has other companies whom they acquired over the years too. ?(Remember PMI?) Andy |
to navigate to use esc to dismiss