Last time I tested several 2N7000 Spice models (2005), there was huge variance between them, and some down-right non-physical behavior. Has...

Last time I tested several 2N7000 Spice models (2005), there was huge variance between them, and some down-right non-physical behavior. Has anyone found a better 2N7000 model since then? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Anal...

We have some sims that run absurdly slow. What are your favorite speedups? In LT spice, I have arbitrarily done .opt reltol=.002 .opt...

We have some sims that run absurdly slow. What are your favorite speedups? In LT spice, I have arbitrarily done .opt reltol=.002 .opt abstol=5n .opt trtol=5 but that's just guessing. It may work with my parts but mess up an encrypted model that I have no visibility into. Sometimes one solver is unaccountably better than another.

Is there a Spice model of a photo diode that delivers current ( laser_power, Vbias ...) ?? I'm not yet bound to a certain...

Is there a Spice model of a photo diode that delivers current ( laser_power, Vbias ...) ?? I'm not yet bound to a certain type. Application is low frequency, but very low noise. And Phil, some of your papers were a tremendous help! Cheers, Gerhard

Hi Dear all, Please help me to add following libraries in LT-Spice. 1. RFZ44 2. Centered tapped Transformer 3. PV cell Thank...

Hi Dear all, Please help me to add following libraries in LT-Spice. 1. RFZ44 2. Centered tapped Transformer 3. PV cell Thank you in advance for your answer and cooperation. Regards, Qasim

On the Device Models & Subcircuits Page of my website... ADCMP551_JT.zip Spice Model for the Analog Devices ADCMP551 Single-Supply High...

On the Device Models & Subcircuits Page of my website... ADCMP551_JT.zip Spice Model for the Analog Devices ADCMP551 Single-Supply High Speed PECL/LVPECL Comparator. Has been updated to handle the 'GND' terminal to be attached to an arbitrary potential. It is also now unencrypted ;-) And will run on any Berkeley Spice compliant simulator. ...

I am new to Spice as well as LT Spice. I have input most of my circuit after spending much time looking for components. I have not run the...

I am new to Spice as well as LT Spice. I have input most of my circuit after spending much time looking for components. I have not run the circuit yet since I have a hole where a unijunction goes. The circuit additionally uses a triac, scr and transistor. I found the *Programable Unijunction Transistor pkg: TO-226AA .SUBCKT X2N6027 1 2 3 for a "generic" (to me) unijunction. B...

Here's a quantizer in LT Spice: ftp://jjlarkin.lmi.net/Quantizer.jpg It wasn't hard, but the HELP is really obscure about syntax, and...

Here's a quantizer in LT Spice: ftp://jjlarkin.lmi.net/Quantizer.jpg It wasn't hard, but the HELP is really obscure about syntax, and there is no example of a schematic with a b-source that I could find. There is a sample-and-hold schematic symbol, so one can simulate the effects of a clocked ADC or a DAC on a control loop. John Version 4 SHEET 1 880 680 WIRE 48 48 0 48 W...

Colleagues, After a long break in the use of LT-SPICE (IV) I attempted installing the up-to-date version v17. However its EULA...

Colleagues, After a long break in the use of LT-SPICE (IV) I attempted installing the up-to-date version v17. However its EULA begins as: "The Licensed Software consists of application software designed to run on personal computers ("PC Software"). 1. Licenses. Subject to the terms and conditions of this Agreement, Analog Devices grants to Licensee a non-exclusive, non-transferab...

Anyone have a L6561 Spice Model ? Or a link to same? Looks like ST is playing the same game as Analog Devices and other manufacturers......

Anyone have a L6561 Spice Model ? Or a link to same? Looks like ST is playing the same game as Analog Devices and other manufacturers... you can only simulate on their tool :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixe...

I'm behaviorally modeling a _system_ that includes the discrete device Supertex VP2450. At the Supertex/Microchip site, it says no Spice model...

I'm behaviorally modeling a _system_ that includes the discrete device Supertex VP2450. At the Supertex/Microchip site, it says no Spice model available :-) Does anyone know of a model? Thanks! ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et ...

IntuitSoft has a program called Spicemod (http://www.intusoft.com/spicemod.htm#Requirements) It's a "SPICE model builder" that takes data...

IntuitSoft has a program called Spicemod (http://www.intusoft.com/spicemod.htm#Requirements) It's a "SPICE model builder" that takes data sheet parameters and makes SPICE models -- including using subcircuits, if just a .MODEL statement isn't going to be enough. I'm skeptical. Has anyone used it? Have you had good success? Do you think that models (particularly IGBT models) that ...

If I single-click on an .asc file in Windows Explorer, I see the schematic thumbnail at the bottom of the window. How does that work? It...

If I single-click on an .asc file in Windows Explorer, I see the schematic thumbnail at the bottom of the window. How does that work? It works for symbols too, .asy files. Does Windows invoke LT Spice to make the thumbnail images? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.hi...

Anyone Have Spice model for JFET IF400? It's only used as a diode in the discrete circuit I have been asked to model behaviorally, but it's...

Anyone Have Spice model for JFET IF400? It's only used as a diode in the discrete circuit I have been asked to model behaviorally, but it's the only model I haven't been able to find :-( ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Ana...

https://www.dropbox.com/s/1xx7sz1e5rg6jsi/JLDDS_100M_4K.jpg?raw=1 https://www.dropbox.com/s/3859sc4qayv3jva/JLDDS_100M_4K_A.asc?dl=0 It...

https://www.dropbox.com/s/1xx7sz1e5rg6jsi/JLDDS_100M_4K.jpg?raw=1 https://www.dropbox.com/s/3859sc4qayv3jva/JLDDS_100M_4K_A.asc?dl=0 It would have been a horror to build a digital phase accumulator in LT Spice, so I did it with the bootstrapped sample-and-hold. 1 LSB is 1 volt, making a 4 kilovolt sawtooth. Close enough. We'll probably do this in a cute little efinix FPGA (digitally...

Anyone have any pointers to SPICE models for Xenon flash tubes? Or at least data sheets that have the I-V characteristics described or...

Anyone have any pointers to SPICE models for Xenon flash tubes? Or at least data sheets that have the I-V characteristics described or graphed? (This is for a hobby project involving discarded photoflash units, a 19 year old kid, and various web pages on building coil guns, by the way). Thanks in advance. -- My liberal friends think I'm a conservative kook. My conservative friends...

Varistor/MOV Spice Modeling has been updated. See VaristorMOV.zip on the Device Models & Subcircuits Page of my website. ...

Varistor/MOV Spice Modeling has been updated. See VaristorMOV.zip on the Device Models & Subcircuits Page of my website. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Sa...

Analog Devices makes some nice PECL comparators, but the data sheets are old and iffy, and there don't seem to be any Spice models. It...

Analog Devices makes some nice PECL comparators, but the data sheets are old and iffy, and there don't seem to be any Spice models. It was raining and snowing and I couldn't go skiing, so I did a behavioral model. I plan to use one of these to make a pretty good 500 MHz oscillator, so I wanted to get it mostly right. Jim's TANH thing is a nice way to make a saturating stage. The open-emit...

Imagine a 14-bit ripple counter driving an R-2R DAC, to make a stairstep waveform. I can clean up the glitches with a sample/hold. I'm clocking...

Imagine a 14-bit ripple counter driving an R-2R DAC, to make a stairstep waveform. I can clean up the glitches with a sample/hold. I'm clocking at 1 Hz. That works. I can export the waveform, but Spice picks the sample rate, and I get multiple data points per waveform step. Is there some way to plot and export one point per second, namely every waveform step? Later, I'll have all 14 c...

Could someone here shed some light on this ? I am experimenting with envelope detection at RF frequencies with SPICE. The mixer is a simple...

Could someone here shed some light on this ? I am experimenting with envelope detection at RF frequencies with SPICE. The mixer is a simple SPICE B signal source as B0 3 4 V(1)*V(2) where 1, 2 are the nodes at which the two signal sources are attached. THe mixer output is fed into a Schottky diode(1N5818, BAR42 etc.,) and a shunt capacitor is attached to the Schottky diode cathode. ...

Awhile back someone on the LTspice List requested a TL598 Spice model. While somewhat obsolete, it intrigued me, and proved to be somewhat...

Awhile back someone on the LTspice List requested a TL598 Spice model. While somewhat obsolete, it intrigued me, and proved to be somewhat of a !#$* to model... but it caused me to develop a few new functions in my behavioral modeling repertoire. It can be found at TL598.zip on the Device Models & Subcircuits Page of my website... including an LTspice symbol. Modeling is based only fro...