LTSpice netlist export question

Started by bitrex in sci.electronics.design4 years ago 2 replies

I'm playing with a software that uses genetic/evolutionary algorithms to optimize stuff like filter designs, etc. For LTSpice to be used as...

I'm playing with a software that uses genetic/evolutionary algorithms to optimize stuff like filter designs, etc. For LTSpice to be used as the simulation engine it requires a netlist in .net file format, question is that LTSpice's netlist export function can apparently generate several different types of file for the .net extension: "ExpressPCB", "Intergraph", "Mentor", "Multiwire", an...


Monospace font in LTspice XVII

Started by Simon S Aysdie in sci.electronics.design4 years ago

Courier New is gone? No Unicode? LTspice IV had Courier New. None of the new and limited set seems to be monospaced.

Courier New is gone? No Unicode? LTspice IV had Courier New. None of the new and limited set seems to be monospaced.


Is this Intel i7 machine good for LTSpice?

Started by Joerg in sci.electronics.design7 years ago 237 replies

Folks, Need to spiff up my simulation speeds here. IIRC Mike Engelhardt stated that the Intel i7 is a really good processor for LTSPice....

Folks, Need to spiff up my simulation speeds here. IIRC Mike Engelhardt stated that the Intel i7 is a really good processor for LTSPice. According to this it looks like the 4790 is the fastest of the bunch: http://www.intel.com/content/www/us/en/processors/core/core-i7-processor.html So, what do thee say, is the computer in the Costco link below a good deal for LTSpice purposes? htt...


F4, not working in LTSpice

Started by bitrex in sci.electronics.design6 years ago 11 replies

I recently did a reinstall of LTSpice on a new machine, and for some reason the F4 and F9 hotkeys are not working. Hitting F9 from within the...

I recently did a reinstall of LTSpice on a new machine, and for some reason the F4 and F9 hotkeys are not working. Hitting F9 from within the program actually causes the Windows 8.1 search sidebar to pop up. Anyone know how to fix this? Thanks.


LTspice Measurements

Started by rickman in sci.electronics.design9 years ago 12 replies

I have always found the documents for LTspice to be rather spartan at best. It looks like there are a lot of third parties who are helping by...

I have always found the documents for LTspice to be rather spartan at best. It looks like there are a lot of third parties who are helping by chipping in their shots at tutorials and docs. But they are mostly introductions and getting started guides covering only the most basic stuff. I am trying to do what should be some simple measurements on a tuned circuit. I want to see how va...


LTSpice: Complex numbers?

Started by Joerg in sci.electronics.design8 years ago 6 replies

Folks, Is there a way to coax LTSpice to display complex numbers in the form of x+jY (or x-jy if leading phase)? -- Regards,...

Folks, Is there a way to coax LTSpice to display complex numbers in the form of x+jY (or x-jy if leading phase)? -- Regards, Joerg http://www.analogconsultants.com/


Logic circuits in LTSpice

Started by bitrex in sci.electronics.design5 years ago 26 replies

When simulating purely digital circuits in LTSpice (with the exception maybe of pull-up and pull-down resistors, etc.) is it best to use the...

When simulating purely digital circuits in LTSpice (with the exception maybe of pull-up and pull-down resistors, etc.) is it best to use the "standard" solver in the settings, or the "alternate"?


output file with ltspice

Started by Jean-Pierre Coulon in sci.electronics.design2 years ago 7 replies

How can I cause ltspice to make an output file (extension = .out) with the initial voltages, BJT info and outputs of my .print...

How can I cause ltspice to make an output file (extension = .out) with the initial voltages, BJT info and outputs of my .print commands? Bye, -- Jean-Pierre Coulon


LTSPICE square wave

Started by bitrex in sci.electronics.design6 years ago 44 replies

Is there a way to make a square wave using the LTSPICE ac voltage source which doesnt have a DC offset, i.e. alternates between -5 and +5,...

Is there a way to make a square wave using the LTSPICE ac voltage source which doesnt have a DC offset, i.e. alternates between -5 and +5, say? I can't seem to figure it out. Thanks. -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/


AN: LTspice Model & Symbol Posted for LM361 High Speed Differential Comparator

Started by Jim Thompson in sci.electronics.design6 years ago

LTspice Model & Symbol Posted for LM361 High Speed Differential Comparator on the Device Models & Subcircuits Page of my website. Totally...

LTspice Model & Symbol Posted for LM361 High Speed Differential Comparator on the Device Models & Subcircuits Page of my website. Totally behavioral... runs so fast on LTspice I thought there was an error ;-) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations ...


Flip-Flop in LTSpice, set/reset assertion?

Started by Joerg in sci.electronics.design2 years ago 20 replies

Today I found that a simulation wasn't working right because the set and reset on the flip-flop (dflop) in LTSpice has the set and reset inputs...

Today I found that a simulation wasn't working right because the set and reset on the flip-flop (dflop) in LTSpice has the set and reset inputs active high. Yet every modern flip-flop is active low. So I had to invert everything on those inputs just for the simulation. The "Special Functions" instructions in LTSPice are silent about this issue. Does this date back to the days of Methusa...


how to flip a component in ltspice?

Started by Komal Swami in sci.electronics.design7 years ago 5 replies

there is a facility to rotate a nmos4 and pmos4 in ltspice but i want to flip my component. so please suggest me any solution.

there is a facility to rotate a nmos4 and pmos4 in ltspice but i want to flip my component. so please suggest me any solution.


Overriding .MODEL paramaters for Trannies.

Started by Maynard A. Philbrook Jr. in sci.electronics.design7 years ago 28 replies

Is there a way that any one knows of in Ltspice to override a .MODEL of NPN for example, parameter? I mean something you pick out of the...

Is there a way that any one knows of in Ltspice to override a .MODEL of NPN for example, parameter? I mean something you pick out of the database and drop on the sheet? For example, the other day some one here was talking about issues with Vbe values and a transistor number was posted that had a Vbeo of 25v. That got me thinking, so I fired up Ltspice and found that none of t...


EvoSpice 4.1 Free Optimizer for LTSpice IV

Started by Anonymous in sci.electronics.design9 years ago 1 reply

EvoSpice 4.1 is now available for free. http://evospice.site88.net/ It automatically adjusts component values in a LTSpice IV simulation to find...

EvoSpice 4.1 is now available for free. http://evospice.site88.net/ It automatically adjusts component values in a LTSpice IV simulation to find the optimum solution according to the objectives you have set.


74HC4046 Model Development

Started by Jim Thompson in sci.electronics.design9 years ago 23 replies

I have been notified by Helmut Sennewald that the LTspice encryption process hides the node sequence. So please...

I have been notified by Helmut Sennewald that the LTspice encryption process hides the node sequence. So please revisit... http://www.analog-innovations.com/SED/HC4046_SUB.zip for a corrected version. This is just the VCO portion for now, and just the variable part; suitable only for LTspice. Please try it out and let me know your comments, etc. Since I'm new to working with LTsp...


74HC74 oscillator simulation

Started by bitrex in sci.electronics.design2 years ago 36 replies

IRL I don't think there's anything this configuration of the 'HC74 could do but oscillate; with an RC network from not-Q to not-CLR and D, CLK,...

IRL I don't think there's anything this configuration of the 'HC74 could do but oscillate; with an RC network from not-Q to not-CLR and D, CLK, and not-PRE grounded. But with these models from the Yahoo LTSpice users group the LTSPice time domain looks like it manages to find some other metastable state and sits there spinning its wheels. Can anyone suggest some ICs that could bust i...


Variable inductor in LTSpice

Started by Piotr Wyderski in sci.electronics.design6 years ago 11 replies

How do I define a voltage (or current)-dependent inductor in LTSpice? In the case of a resistor I simply write R=100*V(Vkey), but the simulator...

How do I define a voltage (or current)-dependent inductor in LTSpice? In the case of a resistor I simply write R=100*V(Vkey), but the simulator refuses to accept L=... I don't care about hysteresis, pure reactance is all I want to simulate now. The non-linear effects need to wait. Bets regards, Piotr


LTSpice multicore usage

Started by bitrex in sci.electronics.design6 years ago

Does anyone have experience in how effectively LTSpice leverages multicore processors? Is it also architecture/processor specific? In the...

Does anyone have experience in how effectively LTSpice leverages multicore processors? Is it also architecture/processor specific? In the setup for a sim I can select how many cores I wish to devote to the simulation. I have a cheap Celeron netbook that I use when I'm out (the beater laptop) which has two cores (probably not the type of machine one should really be using, but it does ok...


LTspice XVII INI File?

Started by Jim Thompson in sci.electronics.design4 years ago 3 replies

Facing the realities that I'm going to have to deal with LTspice, I've decided to become the expert ;-) Noting that the INI file...

Facing the realities that I'm going to have to deal with LTspice, I've decided to become the expert ;-) Noting that the INI file contains: SymbolSearchPath= LibrarySearchPath= Does anyone know if these fields can have multiple entries/directories, perhaps separated by ";", as in PSpice? This would be a handy feature and would somewhat obviate the current restriction of schematic an...


error in simulate bug zapper on ltspice

Started by Felipe Paulo in sci.electronics.design8 years ago 36 replies

I am trying simulate a bug zapper in ltspice, but don=B4t works. My design=20 http://www.4shared.com/file/p25A-LfJ/bugzapper.html What is...

I am trying simulate a bug zapper in ltspice, but don=B4t works. My design=20 http://www.4shared.com/file/p25A-LfJ/bugzapper.html What is wrong?