On Tue, 18 Aug 2015 14:42:09 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>On 08/18/2015 02:02 PM, Jim Thompson wrote: >> On Thu, 13 Aug 2015 16:38:08 -0700, Jim Thompson >> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>> On Thu, 13 Aug 2015 16:19:09 -0700, Jim Thompson >>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>> >>>> On Sun, 9 Aug 2015 16:24:53 -0700 (PDT), Phil Hobbs >>>> <pcdhobbs@gmail.com> wrote: >>>> >>>>> Hi, Jim, >>>>> >>>>> If you've got some spare bandwidth, I could really use an improved OPA2140 model. >>>>> >>>>> It's a very good part for moderate speed, low current, high linearity TIAs, but it's a bear to simulate because the model won't converge on an operating point in LTspice. >>>>> >>>>> I took the TINA model TI supplies and replaced the VSWITCH cards with LTspice SW cards with negative hysteresis (more or less like your fave tanh curve), but it still won't converge on ac or noise sims. >>>>> >>>>> Thanks >>>>> >>>>> Phil Hobbs >>>> >>>> Fit to the AC and slew-rate characteristics... >>>> >>>> <http://www.analog-innovations.com/SED/Fit_OPA2140.pdf> >>>> >>>> No swing limits yet, but I'm only up to 35 lines >:-} >>>> >>>> ...Jim Thompson >>> >>> Versus 467 lines in TI's model. >>> >>> And I'm just fitting graphs in the datasheet, so no relation to >>> internal components and no obfuscation needed. >>> >>> ...Jim Thompson >> >> Further improvement... >> >> <http://www.analog-innovations.com/SED/OPA2140_LG_LP_Noise.pdf> >> >> Figured out how to nail 1/f noise... I can even twiddle the exponent >> ;-) >> >> I miss matching the TI noise model above ~300MHz but, given the rest >> of the TI model is not well-behaved, I not sure I'm the one in the >> wrong. >> >> ...Jim Thompson >> >Nice. Can you post the model? > >Cheers > >Phil HobbsI still have to add swing limits, etc. If your purposes are for just noise, I can send you a copy privately. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
AN: TL598 Spice Model
Started by ●August 9, 2015
Reply by ●August 18, 20152015-08-18
Reply by ●August 18, 20152015-08-18
>I still have to add swing limits, etc. �If your purposes are for just >noise, I can send you a copy privately.No worries, I'll wait for the final masterpiece. ;) Cheers Phil Hobbs
Reply by ●August 18, 20152015-08-18
On Tue, 18 Aug 2015 14:27:25 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>On Tue, 18 Aug 2015 14:42:09 -0400, Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote: > >>On 08/18/2015 02:02 PM, Jim Thompson wrote: >>> On Thu, 13 Aug 2015 16:38:08 -0700, Jim Thompson >>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>> >>>> On Thu, 13 Aug 2015 16:19:09 -0700, Jim Thompson >>>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>> >>>>> On Sun, 9 Aug 2015 16:24:53 -0700 (PDT), Phil Hobbs >>>>> <pcdhobbs@gmail.com> wrote: >>>>> >>>>>> Hi, Jim, >>>>>> >>>>>> If you've got some spare bandwidth, I could really use an improved OPA2140 model. >>>>>> >>>>>> It's a very good part for moderate speed, low current, high linearity TIAs, but it's a bear to simulate because the model won't converge on an operating point in LTspice. >>>>>> >>>>>> I took the TINA model TI supplies and replaced the VSWITCH cards with LTspice SW cards with negative hysteresis (more or less like your fave tanh curve), but it still won't converge on ac or noise sims. >>>>>> >>>>>> Thanks >>>>>> >>>>>> Phil Hobbs >>>>> >>>>> Fit to the AC and slew-rate characteristics... >>>>> >>>>> <http://www.analog-innovations.com/SED/Fit_OPA2140.pdf> >>>>> >>>>> No swing limits yet, but I'm only up to 35 lines >:-} >>>>> >>>>> ...Jim Thompson >>>> >>>> Versus 467 lines in TI's model. >>>> >>>> And I'm just fitting graphs in the datasheet, so no relation to >>>> internal components and no obfuscation needed. >>>> >>>> ...Jim Thompson >>> >>> Further improvement... >>> >>> <http://www.analog-innovations.com/SED/OPA2140_LG_LP_Noise.pdf> >>> >>> Figured out how to nail 1/f noise... I can even twiddle the exponent >>> ;-) >>> >>> I miss matching the TI noise model above ~300MHz but, given the rest >>> of the TI model is not well-behaved, I not sure I'm the one in the >>> wrong. >>> >>> ...Jim Thompson >>> >>Nice. Can you post the model? >> >>Cheers >> >>Phil Hobbs > >I still have to add swing limits, etc. If your purposes are for just >noise, I can send you a copy privately. > > ...Jim ThompsonPresent model has fixed (by parameter) output swing. What would you swing be, zero to ?? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●August 18, 20152015-08-18
On 8/18/2015 5:34 PM, Jim Thompson wrote:> On Tue, 18 Aug 2015 14:27:25 -0700, Jim Thompson > <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >> On Tue, 18 Aug 2015 14:42:09 -0400, Phil Hobbs >> <pcdhSpamMeSenseless@electrooptical.net> wrote: >> >>> On 08/18/2015 02:02 PM, Jim Thompson wrote: >>>> On Thu, 13 Aug 2015 16:38:08 -0700, Jim Thompson >>>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>> >>>>> On Thu, 13 Aug 2015 16:19:09 -0700, Jim Thompson >>>>> <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >>>>> >>>>>> On Sun, 9 Aug 2015 16:24:53 -0700 (PDT), Phil Hobbs >>>>>> <pcdhobbs@gmail.com> wrote: >>>>>> >>>>>>> Hi, Jim, >>>>>>> >>>>>>> If you've got some spare bandwidth, I could really use an improved OPA2140 model. >>>>>>> >>>>>>> It's a very good part for moderate speed, low current, high linearity TIAs, but it's a bear to simulate because the model won't converge on an operating point in LTspice. >>>>>>> >>>>>>> I took the TINA model TI supplies and replaced the VSWITCH cards with LTspice SW cards with negative hysteresis (more or less like your fave tanh curve), but it still won't converge on ac or noise sims. >>>>>>> >>>>>>> Thanks >>>>>>> >>>>>>> Phil Hobbs >>>>>> >>>>>> Fit to the AC and slew-rate characteristics... >>>>>> >>>>>> <http://www.analog-innovations.com/SED/Fit_OPA2140.pdf> >>>>>> >>>>>> No swing limits yet, but I'm only up to 35 lines >:-} >>>>>> >>>>>> ...Jim Thompson >>>>> >>>>> Versus 467 lines in TI's model. >>>>> >>>>> And I'm just fitting graphs in the datasheet, so no relation to >>>>> internal components and no obfuscation needed. >>>>> >>>>> ...Jim Thompson >>>> >>>> Further improvement... >>>> >>>> <http://www.analog-innovations.com/SED/OPA2140_LG_LP_Noise.pdf> >>>> >>>> Figured out how to nail 1/f noise... I can even twiddle the exponent >>>> ;-) >>>> >>>> I miss matching the TI noise model above ~300MHz but, given the rest >>>> of the TI model is not well-behaved, I not sure I'm the one in the >>>> wrong. >>>> >>>> ...Jim Thompson >>>> >>> Nice. Can you post the model? >>> >>> Cheers >>> >>> Phil Hobbs >> >> I still have to add swing limits, etc. If your purposes are for just >> noise, I can send you a copy privately. >> >> ...Jim Thompson > > Present model has fixed (by parameter) output swing. What would you > swing be, zero to ?? > > ...Jim Thompson >I usually use it at +15 and either ground or some smaller negative supply. So maybe +14.8 to -14.9 or something like that--it's easy to arrange customer sims so as not to mislead anybody, except when a RRO op amp doesn't go near the rails. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
