¿ªÔÆÌåÓý

Date
Re: LTSpive IV vs XVII voltage generators
I remember I noticed this but also that there was an entry in the changelog about this and, sure enough, here it is: 04/24/18 Corrected the behavior of SINE voltage and current sources when Ncycles is
By Vlad · #108542 ·
Re: Edge triggered b-source logic and integrated averaging in LTspice
Hello analogspiceman, Thanks for your uploaded example "sampled_average_expanded.asc". I have now a better understanding after I plotted V(4), V(3) , V(x) and V(s) in one plot.
By Helmut Sennewald · #108541 ·
Re: Frequency calc durung trans sim
Agreed. (Although Mike is brilliant he can be very stubborn once his mind is closed.) ---In LTspice@..., <helmutsennewald@...> wrote : Hello analogspiceman, I have been aware of this
By analog spiceman · #108540 ·
Re: Frequency calc durung trans sim
Hello analogspiceman, I have been aware of this command, but it would be a nightmare to download a few thousands of my schematics, modify it and upload it again. I would also loose the time stamp
By Helmut Sennewald · #108539 ·
Re: How to include component values in LTSpice trace formulas
Correction. Replace ^ by **, and the last number should be 10**(-15).? It may be possible to work round the '1F' problem by changing it to '1C/1V', which is '1 coulomb per volt'. John Woodgate
By John Woodgate · #108538 ·
Re: How to include component values in LTSpice trace formulas
You should first of all, read the Help. It is very information-intensive, so it needs reading carefully and reading several time. There is a special way of treating capacitors that do unusual things
By John Woodgate · #108537 ·
Re: LTSpive IV vs XVII voltage generators
Small correction to my reply -- In LTspice IV, at the end of Ncycles, the output of the source suddenly reverted to Voffset or Ioffset, not necessarily to zero. Regards, Andy
By Andy · #108536 ·
Re: Frequency calc durung trans sim
Hello Helmut, Mike added a command line switch to automatically resize text when an old file is opened with this switch, but it is a lot of trouble to use and it often only fixes some of the text.
By analog spiceman · #108535 ·
Re: LTSpive IV vs XVII voltage generators
Larry wrote about changed behavior between LTspice IV and LTspice XVII, when a sine wave voltage or current source has Ncycles. "I assume this was done intentionally or is this possibly an error."
By Andy · #108533 ·
Re: LTSpive IV vs XVII voltage generators
Hello Larry, I would assume it was done intentionally. Although there may be arguments for both behaviors, the current behavior seems correct to me. A simple sine wave is not the only case to
By analog spiceman · #108532 ·
Re: LTSpive IV vs XVII voltage generators
Hello Larry, I haven't discovered this behavior, because I used sine-burst only a very few times in 17 years. I just checked your reported case and indeed it's different in LTspiceXVII. It's difficult
By Helmut Sennewald · #108534 ·
Re: How to include component values in LTSpice trace formulas
Doug asked: "I would like to be able to define a trace for the energy stored in a capacitor using the formula E= 1/2 * V^2 * C. But I can't find how to include component values such as capacitance, C,
By Andy · #108531 ·
Re: Frequency calc durung trans sim
Hello eT, Have you tried my older eyamples before? freq_meter_test1.zip, freq_meter_test2.zip https://groups.yahoo.com/neo/groups/LTspice/files/%20Tut/
By Helmut Sennewald · #108530 ·
LTSpive IV vs XVII voltage generators
I loaded an old circuit that was created in LTSpice IV into LTSpice XVII today and noticed that the voltage acts differently. Specifying a sine wave voltage source with some number of cycles and some
By Larry Benko · #108529 ·
Re: Edge triggered b-source logic and integrated averaging in LTspice
Hello Vlad, I noticed that bug and reported it several days ago. Perhaps it would help if you reported it as well. It only is a problem for "B I=" sources that include a defined function and that
By analog spiceman · #108526 ·
Frequency calc durung trans sim
Hi everyone I'm working on a B device method to calculate the frequency of a square wave during a trans sim. I'm uploading a file "CalcFreqFromTonToff.zip". Its not a real accurate method but I was
By eetech00 · #108527 ·
How to include component values in LTSpice trace formulas
Just joined the group and don't know how to search whether this has already been addressed - guidance on that would be appreciated! But here's my question: I would like to be able to define a trace
By Doug Fay · #108528 ·
Re: Edge triggered b-source logic and integrated averaging in LTspice
Hello analogspiceman It's a nice example on how to use idt() as idt(0, x, y), instead of the more usual idt(x,
By Vlad · #108525 ·
Re: Edge triggered b-source logic and integrated averaging in LTspice
Hello analogspiceman, Thanks a lot for ths idea of a "sampled" average. I have made an example with your formulas. Please check my circuit. I wonder a little bit were the integration really starts and
By Helmut Sennewald · #108524 ·
Edge triggered b-source logic and integrated averaging in LTspice
Hello all, These following functions are intended to be used in b-sources. The first two replicate edge triggered logic such as is used in the a-device DFLOP clock input. The last function is more
By analog spiceman · #108523 ·