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 |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| STV, Queen Creek, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
Thinking outside the box... producing elegant solutions,
by understanding what nature is hiding.
"It is not in doing what you like, but in liking what you do that
is the secret of happiness." -James Barrie
Anyone Have Spice model for JFET IF400?
Started by ●April 27, 2018
Reply by ●April 27, 20182018-04-27
On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>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 ThompsonSorry! TYPO. Should be IF140 :-( ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions, by understanding what nature is hiding. "It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie
Reply by ●April 27, 20182018-04-27
On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>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 ThompsonJfets are terrible diodes. Lots of capacitance and lots of series resistance, and enormous (like, 1 pA) reverse leakage. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●April 27, 20182018-04-27
On Fri, 27 Apr 2018 17:30:19 -0700, John Larkin <jjlarkin@highland_snip_technology.com> wrote:>On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >>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 > >Jfets are terrible diodes. Lots of capacitance and lots of series >resistance, and enormous (like, 1 pA) reverse leakage.That reverse leakage is what I think they are using them for. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions, by understanding what nature is hiding. "It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie
Reply by ●April 27, 20182018-04-27
How about a PAD1 model, any of those floating around? 2N4117? Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/ "Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in message news:7di7edhuvcpfviia7bei9k0foa7jtqjbm1@4ax.com...> On Fri, 27 Apr 2018 17:30:19 -0700, John Larkin > <jjlarkin@highland_snip_technology.com> wrote: > >>On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>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 >> >>Jfets are terrible diodes. Lots of capacitance and lots of series >>resistance, and enormous (like, 1 pA) reverse leakage. > > That reverse leakage is what I think they are using them for. > > ...Jim Thompson > -- > | James E.Thompson | mens | > | Analog Innovations | et | > | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | > | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | > | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | > | E-mail Icon at http://www.analog-innovations.com | 1962 | > > Thinking outside the box... producing elegant solutions, > by understanding what nature is hiding. > > "It is not in doing what you like, but in liking what you do that > is the secret of happiness." -James Barrie
Reply by ●April 27, 20182018-04-27
On Fri, 27 Apr 2018 20:23:34 -0500, "Tim Williams" <tiwill@seventransistorlabs.com> wrote:>How about a PAD1 model, any of those floating around? 2N4117? > >TimI'll check that. The device in question is IF140... I typo'd :-( Maybe someone knows a cross to IF140? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions, by understanding what nature is hiding. "It is not in doing what you like, but in liking what you do that is the secret of happiness." -James Barrie
Reply by ●April 28, 20182018-04-28
On Fri, 27 Apr 2018 18:10:04 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:>On Fri, 27 Apr 2018 17:30:19 -0700, John Larkin ><jjlarkin@highland_snip_technology.com> wrote: > >>On Fri, 27 Apr 2018 16:56:46 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>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 >> >>Jfets are terrible diodes. Lots of capacitance and lots of series >>resistance, and enormous (like, 1 pA) reverse leakage. > >That reverse leakage is what I think they are using them for. > > ...Jim ThompsonThe c-b junction of a BFT25 is a far superior diode. Below 10 fA by my measurements. Capacitance is something like 0.3 pF. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●April 28, 20182018-04-28
Am 28.04.2018 um 06:40 schrieb John Larkin:> The c-b junction of a BFT25 is a far superior diode. Below 10 fA by my > measurements. Capacitance is something like 0.3 pF. >Did you use BFT25 or BFT25A ? The A-Version has twice the ft. cheers, Gerhard
Reply by ●April 28, 20182018-04-28
Am 28.04.2018 um 04:47 schrieb Jim Thompson:> On Fri, 27 Apr 2018 20:23:34 -0500, "Tim Williams" > <tiwill@seventransistorlabs.com> wrote: > >> How about a PAD1 model, any of those floating around? 2N4117? >> >> Tim > > I'll check that. > > The device in question is IF140... I typo'd :-( > > Maybe someone knows a cross to IF140?I find the "data sheet" quite offensive. Half a page of barn-door wide specs in HTML, not even a .pdf document that you could take as a reference. (as followed from the Mouser link.) For a comparison of 8 IF3602 (probably more uniform than 16 IF3601) see < https://www.flickr.com/photos/137684711@N07/37321004540/in/album-72157662535945536/ > Hey, €55 a pop for the IF3602. :-( regards, Gerhard
Reply by ●April 28, 20182018-04-28
On Sat, 28 Apr 2018 07:34:46 +0200, Gerhard Hoffmann <gerhard@hoffmann-hochfrequenz.de> wrote:>Am 28.04.2018 um 06:40 schrieb John Larkin: > >> The c-b junction of a BFT25 is a far superior diode. Below 10 fA by my >> measurements. Capacitance is something like 0.3 pF. >> > >Did you use BFT25 or BFT25A ? The A-Version has twice the ft. > >cheers, GerhardI used the NXP A version. I always thought, for some reason, that RF parts should be leaky. But that's not so. It's hard to measure 10 fA. -- John Larkin Highland Technology, Inc lunatic fringe electronics
