On Thu, 15 Feb 2018 19:22:03 -0500, krw@notreal.com wrote:>On Thu, 15 Feb 2018 15:09:42 -0600, "Tim Williams" ><tiwill@seventransistorlabs.com> wrote: > >>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in >>message news:crqb8d1rjs0t61vcfhivff9guvcq88htov@4ax.com... >>> Question for you bloviators... Suppose Apple is buying LTspice parts >>> for their phones. Do you think that Apple has to run simulations on >>> LTspice... or is Linear providing Apple with Cadence-level models? I'd >>> bet the latter. >> >>Why would they buy overpriced LT parts when TI, Rohm or $Chinese is half >>price or less? > >I think you'll find that after the ADI acquisition, this will change. >At least that's what they're telling me. ;-)I think the Hittite part prices are a lot more sensible now that ADI acquired them. -- John Larkin Highland Technology, Inc lunatic fringe electronics
LTSpice LED parameters
Started by ●February 14, 2018
Reply by ●February 15, 20182018-02-15
Reply by ●February 15, 20182018-02-15
On Thu, 15 Feb 2018 18:07:27 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>On Thu, 15 Feb 2018 19:19:39 -0500, krw@notreal.com wrote: > >>On Thu, 15 Feb 2018 08:51:44 -0800, John Larkin >><jjlarkin@highlandtechnology.com> wrote: >> >>>On Thu, 15 Feb 2018 09:40:28 -0700, Jim Thompson >>><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>> >>>>On Thu, 15 Feb 2018 10:50:10 -0500, Phil Hobbs >>>><pcdhSpamMeSenseless@electrooptical.net> wrote: >>>> >>>>>On 02/14/2018 04:24 PM, Jim Thompson wrote: >>>>>> On Wed, 14 Feb 2018 15:07:42 -0600, John S <Sophi.2@invalid.org> >>>>>> wrote: >>>>>> >>>>>>> Here is what I have: >>>>>>> >>>>>>> .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA >>>>>>> Vpk=5 mfg=Lumileds type=LED) >>>>>>> >>>>>>> How do I change the Vf at a specified current? I suspect that it is more >>>>>>> involved than just changing Rs. >>>>>>> >>>>>>> Thanks, Guys. >>>>>> >>>>>> Iave, Vpk and "type" are NOT true Spice parameters... they are >>>>>> toyLTspice fudges that use LTspice-specific models that are NOT usable >>>>>> anywhere else. >>>>> >>>>>Like pspice encryption? >>>> >>>>It's not the same thing. LTspice has encryption too, you twit. >>>> >>>>.MODEL D D(...) is a standard device model format that will "play" on >>>>any other Spice-compliant simulator. Mikey's version will not. >>>> >>>>The proper way to handle such a model is to define it as a subcircuit >>>>with parameter-passing. >>>> >>>>Most LTspice models of their standard products won't "play" on any >>>>other simulator. Is that good business? >>> >>>LT Spice is free! It doesn't need to be "good business" in the >>>paid-for simulator market. What it does is sell LTC chips. >>> >>> >>>> >>>>TI seems to have (somewhat) caught on to the fact that they need to >>>>offer across-platform/simulator models. >>>> >>>>Wonder when Analog Devices (nee Linear) will catch on, toss Mikey, and >>>>make available compliant models? >>> >>>I was told that ADI will be migrating to LT Spice. I think that LT >>>Spice is one reason they bought LTC. >> >>I understand that TI is migrating to PSpice. > >Giving up TINA? I hadn't heard that. But, of what I've analyzed, >TINA does not deviate enough from standard Spice to call home about.That's my understanding (from a pretty good source). You can't import models to the (free) TINA. If it's not in their library, forget it. I have no idea if they're going to cripple it or not but I suspect it'll only run on the web and without things like optimization and noise analysis. They're certainly not going to give out free licenses to the full PSpice. Cadence doesn't work that way. ;-)
Reply by ●February 15, 20182018-02-15
"John Larkin" <jjlarkin@highland_snip_technology.com> wrote in message news:gv1c8dhulr5tvjcdohm3dpb07rdic037hv@4ax.com...> Some of their parts are really good. LT1124. LTC3803. LTC2242. Their > stuff is worth it when performance sells a product.I see them a lot in sub-1000/yr products. You are basically their model customer. Anything in quantity, either they negotiated a hell of a deal, or there really isn't a better option. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/
Reply by ●February 15, 20182018-02-15
On Thu, 15 Feb 2018 20:45:34 -0500, krw@notreal.com wrote:>On Thu, 15 Feb 2018 18:07:27 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >>On Thu, 15 Feb 2018 19:19:39 -0500, krw@notreal.com wrote: >> >>>On Thu, 15 Feb 2018 08:51:44 -0800, John Larkin >>><jjlarkin@highlandtechnology.com> wrote: >>> >>>>On Thu, 15 Feb 2018 09:40:28 -0700, Jim Thompson >>>><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>> >>>>>On Thu, 15 Feb 2018 10:50:10 -0500, Phil Hobbs >>>>><pcdhSpamMeSenseless@electrooptical.net> wrote: >>>>> >>>>>>On 02/14/2018 04:24 PM, Jim Thompson wrote: >>>>>>> On Wed, 14 Feb 2018 15:07:42 -0600, John S <Sophi.2@invalid.org> >>>>>>> wrote: >>>>>>> >>>>>>>> Here is what I have: >>>>>>>> >>>>>>>> .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA >>>>>>>> Vpk=5 mfg=Lumileds type=LED) >>>>>>>> >>>>>>>> How do I change the Vf at a specified current? I suspect that it is more >>>>>>>> involved than just changing Rs. >>>>>>>> >>>>>>>> Thanks, Guys. >>>>>>> >>>>>>> Iave, Vpk and "type" are NOT true Spice parameters... they are >>>>>>> toyLTspice fudges that use LTspice-specific models that are NOT usable >>>>>>> anywhere else. >>>>>> >>>>>>Like pspice encryption? >>>>> >>>>>It's not the same thing. LTspice has encryption too, you twit. >>>>> >>>>>.MODEL D D(...) is a standard device model format that will "play" on >>>>>any other Spice-compliant simulator. Mikey's version will not. >>>>> >>>>>The proper way to handle such a model is to define it as a subcircuit >>>>>with parameter-passing. >>>>> >>>>>Most LTspice models of their standard products won't "play" on any >>>>>other simulator. Is that good business? >>>> >>>>LT Spice is free! It doesn't need to be "good business" in the >>>>paid-for simulator market. What it does is sell LTC chips. >>>> >>>> >>>>> >>>>>TI seems to have (somewhat) caught on to the fact that they need to >>>>>offer across-platform/simulator models. >>>>> >>>>>Wonder when Analog Devices (nee Linear) will catch on, toss Mikey, and >>>>>make available compliant models? >>>> >>>>I was told that ADI will be migrating to LT Spice. I think that LT >>>>Spice is one reason they bought LTC. >>> >>>I understand that TI is migrating to PSpice. >> >>Giving up TINA? I hadn't heard that. But, of what I've analyzed, >>TINA does not deviate enough from standard Spice to call home about. > >That's my understanding (from a pretty good source). You can't import >models to the (free) TINA. If it's not in their library, forget it. I >have no idea if they're going to cripple it or not but I suspect it'll >only run on the web and without things like optimization and noise >analysis. They're certainly not going to give out free licenses to >the full PSpice. Cadence doesn't work that way. ;-) >Face it: LT Spice does everything right. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●February 15, 20182018-02-15
On Thursday, February 15, 2018 at 4:09:34 PM UTC-5, Tim Williams wrote:> "Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in > message news:crqb8d1rjs0t61vcfhivff9guvcq88htov@4ax.com... > > Question for you bloviators... Suppose Apple is buying LTspice parts > > for their phones. Do you think that Apple has to run simulations on > > LTspice... or is Linear providing Apple with Cadence-level models? I'd > > bet the latter. > > Why would they buy overpriced LT parts when TI, Rohm or $Chinese is half > price or less?'Cause for low volume, the cost of the box, connectors, switches etc. makes the cost of the stuff inside less important. And I tried the LT/AD part first and it worked. George H.> > Tim > > -- > Seven Transistor Labs, LLC > Electrical Engineering Consultation and Contract Design > Website: https://www.seventransistorlabs.com/
Reply by ●February 15, 20182018-02-15
"George Herold" <gherold@teachspin.com> wrote in message news:a633f2bd-09ca-4a3b-9c66-f252165d6137@googlegroups.com...>> > Question for you bloviators... Suppose Apple is buying LTspice > ^^^^^> 'Cause for low volume, the cost of the box, connectors, switches etc. > makes the cost of the stuff inside less important. > And I tried the LT/AD part first and it worked.Well, we weren't talking about you... :^) Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/
Reply by ●February 15, 20182018-02-15
On Thursday, February 15, 2018 at 5:55:04 PM UTC-8, John Larkin wrote:> Face it: LT Spice does everything right.Not on a MacBook, it doesn't.
Reply by ●February 15, 20182018-02-15
On Thu, 15 Feb 2018 17:55:00 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote:>On Thu, 15 Feb 2018 20:45:34 -0500, krw@notreal.com wrote: > >>On Thu, 15 Feb 2018 18:07:27 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>On Thu, 15 Feb 2018 19:19:39 -0500, krw@notreal.com wrote: >>> >>>>On Thu, 15 Feb 2018 08:51:44 -0800, John Larkin >>>><jjlarkin@highlandtechnology.com> wrote: >>>> >>>>>On Thu, 15 Feb 2018 09:40:28 -0700, Jim Thompson >>>>><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>>> >>>>>>On Thu, 15 Feb 2018 10:50:10 -0500, Phil Hobbs >>>>>><pcdhSpamMeSenseless@electrooptical.net> wrote: >>>>>> >>>>>>>On 02/14/2018 04:24 PM, Jim Thompson wrote: >>>>>>>> On Wed, 14 Feb 2018 15:07:42 -0600, John S <Sophi.2@invalid.org> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Here is what I have: >>>>>>>>> >>>>>>>>> .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA >>>>>>>>> Vpk=5 mfg=Lumileds type=LED) >>>>>>>>> >>>>>>>>> How do I change the Vf at a specified current? I suspect that it is more >>>>>>>>> involved than just changing Rs. >>>>>>>>> >>>>>>>>> Thanks, Guys. >>>>>>>> >>>>>>>> Iave, Vpk and "type" are NOT true Spice parameters... they are >>>>>>>> toyLTspice fudges that use LTspice-specific models that are NOT usable >>>>>>>> anywhere else. >>>>>>> >>>>>>>Like pspice encryption? >>>>>> >>>>>>It's not the same thing. LTspice has encryption too, you twit. >>>>>> >>>>>>.MODEL D D(...) is a standard device model format that will "play" on >>>>>>any other Spice-compliant simulator. Mikey's version will not. >>>>>> >>>>>>The proper way to handle such a model is to define it as a subcircuit >>>>>>with parameter-passing. >>>>>> >>>>>>Most LTspice models of their standard products won't "play" on any >>>>>>other simulator. Is that good business? >>>>> >>>>>LT Spice is free! It doesn't need to be "good business" in the >>>>>paid-for simulator market. What it does is sell LTC chips. >>>>> >>>>> >>>>>> >>>>>>TI seems to have (somewhat) caught on to the fact that they need to >>>>>>offer across-platform/simulator models. >>>>>> >>>>>>Wonder when Analog Devices (nee Linear) will catch on, toss Mikey, and >>>>>>make available compliant models? >>>>> >>>>>I was told that ADI will be migrating to LT Spice. I think that LT >>>>>Spice is one reason they bought LTC. >>>> >>>>I understand that TI is migrating to PSpice. >>> >>>Giving up TINA? I hadn't heard that. But, of what I've analyzed, >>>TINA does not deviate enough from standard Spice to call home about. >> >>That's my understanding (from a pretty good source). You can't import >>models to the (free) TINA. If it's not in their library, forget it. I >>have no idea if they're going to cripple it or not but I suspect it'll >>only run on the web and without things like optimization and noise >>analysis. They're certainly not going to give out free licenses to >>the full PSpice. Cadence doesn't work that way. ;-) >> > >Face it: LT Spice does everything right.Correction: It does everything *you* need (and I'm not so sure about) right.
Reply by ●February 15, 20182018-02-15
On Thu, 15 Feb 2018 17:41:53 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote:>On Thu, 15 Feb 2018 19:22:03 -0500, krw@notreal.com wrote: > >>On Thu, 15 Feb 2018 15:09:42 -0600, "Tim Williams" >><tiwill@seventransistorlabs.com> wrote: >> >>>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in >>>message news:crqb8d1rjs0t61vcfhivff9guvcq88htov@4ax.com... >>>> Question for you bloviators... Suppose Apple is buying LTspice parts >>>> for their phones. Do you think that Apple has to run simulations on >>>> LTspice... or is Linear providing Apple with Cadence-level models? I'd >>>> bet the latter. >>> >>>Why would they buy overpriced LT parts when TI, Rohm or $Chinese is half >>>price or less? >> >>I think you'll find that after the ADI acquisition, this will change. >>At least that's what they're telling me. ;-) > >I think the Hittite part prices are a lot more sensible now that ADI >acquired them.I'll let you know. ADI is quoting us some LT parts. We'll see how close they can get to TI (and others).
Reply by ●February 16, 20182018-02-16
"Jim Thompson" wrote in message news:bjbc8d5f855140u283t3hb464n6g31l8u1@4ax.com... On Thu, 15 Feb 2018 19:19:39 -0500, krw@notreal.com wrote:>On Thu, 15 Feb 2018 08:51:44 -0800, John Larkin ><jjlarkin@highlandtechnology.com> wrote: > >>On Thu, 15 Feb 2018 09:40:28 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>On Thu, 15 Feb 2018 10:50:10 -0500, Phil Hobbs >>><pcdhSpamMeSenseless@electrooptical.net> wrote: >>> >>>>On 02/14/2018 04:24 PM, Jim Thompson wrote: >>>>> On Wed, 14 Feb 2018 15:07:42 -0600, John S <Sophi.2@invalid.org> >>>>> wrote: >>>>> >>>>>> Here is what I have: >>>>>> >>>>>> .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 >>>>>> Iave=400mA >>>>>> Vpk=5 mfg=Lumileds type=LED) >>>>>> >>>>>> How do I change the Vf at a specified current? I suspect that it is >>>>>> more >>>>>> involved than just changing Rs. >>>>>> >>>>>> Thanks, Guys. >>>>> >>>>> Iave, Vpk and "type" are NOT true Spice parameters... they are >>>>> toyLTspice fudges that use LTspice-specific models that are NOT usable >>>>> anywhere else. >>>> >>>>Like pspice encryption? >>> >>>It's not the same thing. LTspice has encryption too, you twit. >>> >>>.MODEL D D(...) is a standard device model format that will "play" on >>>any other Spice-compliant simulator. Mikey's version will not. >>> >>>The proper way to handle such a model is to define it as a subcircuit >>>with parameter-passing. >>> >>>Most LTspice models of their standard products won't "play" on any >>>other simulator. Is that good business? >> >>LT Spice is free! It doesn't need to be "good business" in the >>paid-for simulator market. What it does is sell LTC chips. >> >> >>> >>>TI seems to have (somewhat) caught on to the fact that they need to >>>offer across-platform/simulator models. >>> >>>Wonder when Analog Devices (nee Linear) will catch on, toss Mikey, and >>>make available compliant models? >> >>I was told that ADI will be migrating to LT Spice. I think that LT >>Spice is one reason they bought LTC. > >I understand that TI is migrating to PSpice.>Giving up TINA? I hadn't heard that. But, of what I've analyzed, >TINA does not deviate enough from standard Spice to call home about.Despite SS using the basic Spice3/XSpice engine, I use it extensively, daily in parallel with Cadence Virtuoso, because it has button press WC (Worse Case). I can run 100s of process corners with ease. Without WC, you don't have a design. Period. -- Kevin Aylward http://www.anasoft.co.uk - SuperSpice http://www.kevinaylward.co.uk/ee/index.html
