D
Doug Miller
Guest
In article <4A6D0D8F.F00D8444@earthlink.net>, "Michael A. Terrell" <mike.terrell@earthlink.net> wrote:
In other words... it didn't happen.
M
Michael A. Terrell
Guest
Doug Miller wrote:
Yes, but you just want to argue. Go to the Marion County Florida
Library and hfind it yourself, if yo ucan get some time one one of the
dew still worting microfilm viewers. They are all in use every time I go
there.
--
You can't have a sense of humor, if you have no sense!
Yes, but you just want to argue. Go to the Marion County Florida
Library and hfind it yourself, if yo ucan get some time one one of the
dew still worting microfilm viewers. They are all in use every time I go
there.
--
You can't have a sense of humor, if you have no sense!
D
Doug Miller
Guest
In article <4A6D1DE2.13168798@earthlink.net>, "Michael A. Terrell" <mike.terrell@earthlink.net> wrote:
assume that you made it up.
You claim it happened -- you provide the proof. Until then, I'm going to
assume that you made it up.
M
Michael A. Terrell
Guest
Doug Miller wrote:
Assume whatever you like. The newspaper it was in went to an animal
rescue group long ago.
--
You can't have a sense of humor, if you have no sense!
Assume whatever you like. The newspaper it was in went to an animal
rescue group long ago.
--
You can't have a sense of humor, if you have no sense!
E
ehsjr
Guest
Doug Miller wrote:
Ed
Yeah, it did. May, 2003 Meadowbrook of Ocala Jockey Club
Ed
D
Doug Miller
Guest
In article <5D9bm.1146$646.734@nwrddc01.gnilink.net>, ehsjr <ehsjr@NOSPAMverizon.net> wrote:
contention that the insurance company refused to pay off due to substandard
wiring.
Google search on "Meadowbrook Ocala Jockey Club fire cause" doesn't appear to
turn up anything even indicating the cause, let alone indicating that the
cause was a wiring problem, let alone anything supporting Terrell's claim.
So, like I said -- it didn't happen.
Oh, I don't dispute that there was a fire -- what I dispute is Terrell's
contention that the insurance company refused to pay off due to substandard
wiring.
Google search on "Meadowbrook Ocala Jockey Club fire cause" doesn't appear to
turn up anything even indicating the cause, let alone indicating that the
cause was a wiring problem, let alone anything supporting Terrell's claim.
So, like I said -- it didn't happen.
V
VioletaPachydermata
Guest
On Sun, 26 Jul 2009 22:16:13 -0400, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:
Except that I was talking about your door.
<mike.terrell@earthlink.net> wrote:
Except that I was talking about your door.
B
Bruce L. Bergman
Guest
On Sun, 26 Jul 2009 18:38:14 -0700, Capt. Cave Man wrote:
tenants in that industrial park had hundreds of old machines built to
run on it. Like an army of old Swiss Screw machines cranking out
aerospace fasteners for the Space Race.
If they ask for it, and pay a bit extra for the special
transformers, the utility can provide practically anything you want -
but that's certainly NOT the norm nowadays.
When you hear hoofbeats, you expect Horses - that's a Zebra.
Most industrial gear that takes multiple voltages and is rated for
operation on either 208 or 240V does a lot better at 240V.
You don't see much at all that insists on taking 208V Only. And a
Buck-Boost or three for the individual machine is a lot cheaper than
getting an oddball feeder voltage from the utility.
--<< Bruce >>--
They might well be supplying 208V Ungrounded Delta if the original
tenants in that industrial park had hundreds of old machines built to
run on it. Like an army of old Swiss Screw machines cranking out
aerospace fasteners for the Space Race.
If they ask for it, and pay a bit extra for the special
transformers, the utility can provide practically anything you want -
but that's certainly NOT the norm nowadays.
When you hear hoofbeats, you expect Horses - that's a Zebra.
Most industrial gear that takes multiple voltages and is rated for
operation on either 208 or 240V does a lot better at 240V.
You don't see much at all that insists on taking 208V Only. And a
Buck-Boost or three for the individual machine is a lot cheaper than
getting an oddball feeder voltage from the utility.
--<< Bruce >>--
L
Lostgallifreyan
Guest
Please read the last paragraph of this post, even if you don't want to read
all of it.
Ok, I tried this, and I don't think it's going to work.
I corrected some typos (very few, Marco did a good job given that the
original makes it very hard to see what is or is not a space), one of which
is definitely in the original text, a + beginning a line without which SPICE
can't run because it needs that to indicate continuation. It's safe to say
there might be more errors given the results of running it. First, my typo-
edited copy, which runs in LTspice:
ibias 0 p 10m
xlaser p 0 pf ltest1
rout pf 0 1e9
************************************************************************
.subckt ltest1 p n pf
D1 p nt1 d1mod_ltest1
Ic1 p nt1 3.6641713e-14
Vt1 nt1 n 0
D2 p n d2mod_ltest1
Ic2 p n 3.6641713e-14
Br1 p n i=0*i(Vt1) +20701.692*i(Vt1) *i(Vt1)+28862208
*i(Vt1)*i(Vt1)*i(Vt1)
Bs1 p n i=1.3785977*v(m) *v(m)*ln(1e-60 +5220.1829*i(Vt1)+
+ 54033309*i(Vt1) *i(Vt1)+7.5333001e +10*i(Vt1)*i(Vt1)*i(Vt1))/
+ (1+0.95928574
+ *v(m)*v(m))
Rph m 0 1
Cph m 0 5.518e-12
Br2 0 m i=(0*i(Vt1) +1.0120369*i(Vt1) *i(Vt1)+0*i(Vt1)
*i(Vt1)*I(Vt1))/v(m)
Bs2 0 m i=0.67395059 *v(m)*ln(1e-60 +5220.1829*i(Vt1)
+54033309*i(Vt1)*i(Vt1)+
+ 7.5333001e +10*i(Vt1)*i(Vt1) *i(Vt1))/(1+0.95928574 *v(m)*v(m))
Bpf pf 0 v=v(m)*v(m)
.ends ltest1
.model d1mod_ltest1 D Is=3.6641713e-14 n=2
.model d2mod_ltest1 D Is=3.6641713e-14 n=2 tt=1.8181818e-08
************************************************************************
.dc ibias 0 50m 0.25m
.end
Third of three vertically aligned + signs was absent from original, and is
vital unless you merge that line to the end of the previous one.) I made a
symbol file for LTspice to use this model:
Version 4
SymbolType CELL
LINE Normal -12 -40 -12 -24
LINE Normal -20 -32 -4 -32
LINE Normal -20 32 -4 32
LINE Normal -28 32 -48 32
LINE Normal -28 -32 -48 -32
LINE Normal 76 0 96 0
LINE Normal 48 -16 -16 -16
LINE Normal 16 16 48 -16
LINE Normal -16 -16 16 16
LINE Normal 48 16 -16 16
SYMATTR Value ltest1
SYMATTR Prefix X
SYMATTR ModelFile LD_TEST.sub
SYMATTR Value2 ltest1
SYMATTR Description Unknown laser diode model.
PIN -48 -32 NONE 0
PINATTR PinName PIN+
PINATTR SpiceOrder 1
PIN -48 32 NONE 0
PINATTR PinName PIN-
PINATTR SpiceOrder 2
PIN 96 0 NONE 0
PINATTR PinName OUT
PINATTR SpiceOrder 3
Ignore the terrible graphic if you try this, it was a rough edit of one of my
op-amp symbols, it was the fastest way to make something useable...
Anyway, it's an odd result! If I make a simple LM317 based constant current
driver circuit (I have a good LM317 model now) and set the current for 152 mA
using an 8R2 resistor, the current is steady but at more current than it
should be! The model appears to be generating virtual energy.
Worse, a
voltage plot of the anode end shows a rediculous curve, a relaxation
oscillator type sawtooth varying once every 50 microseconds, and between 0V
(Ground) and MINUS 12 KILOVOLTS! That can NOT be right...
I really don't think I'm going to use this. And I suspect we wouldn't have to
be bombed back to the stone age, or even to the technical levels current when
the Alexandria Library was burned, to render that document as arcane as one
of Harry Potter's spells. It's obviously not meant for the purpose I'm trying
to put it to even if by a wild fluke I can figure out how to make it work
right, and I don't think I even have leave to SEE it, technically, so I ask
yet again, please can someone help me to find how to adapt a standard diode
model to emulate a laser diode, electrically, well enough to design simple
drivers for? I need to see if learning SPICE is going to be useful. So far I
notive very different behaviour depending on whether I use 4 series 1N4005's
or 4 series 1N4148's, so clearly I do need something better than plugging in
the first diodes I can find.
all of it.
Ok, I tried this, and I don't think it's going to work.
I corrected some typos (very few, Marco did a good job given that the
original makes it very hard to see what is or is not a space), one of which
is definitely in the original text, a + beginning a line without which SPICE
can't run because it needs that to indicate continuation. It's safe to say
there might be more errors given the results of running it. First, my typo-
edited copy, which runs in LTspice:
ibias 0 p 10m
xlaser p 0 pf ltest1
rout pf 0 1e9
************************************************************************
.subckt ltest1 p n pf
D1 p nt1 d1mod_ltest1
Ic1 p nt1 3.6641713e-14
Vt1 nt1 n 0
D2 p n d2mod_ltest1
Ic2 p n 3.6641713e-14
Br1 p n i=0*i(Vt1) +20701.692*i(Vt1) *i(Vt1)+28862208
*i(Vt1)*i(Vt1)*i(Vt1)
Bs1 p n i=1.3785977*v(m) *v(m)*ln(1e-60 +5220.1829*i(Vt1)+
+ 54033309*i(Vt1) *i(Vt1)+7.5333001e +10*i(Vt1)*i(Vt1)*i(Vt1))/
+ (1+0.95928574
+ *v(m)*v(m))
Rph m 0 1
Cph m 0 5.518e-12
Br2 0 m i=(0*i(Vt1) +1.0120369*i(Vt1) *i(Vt1)+0*i(Vt1)
*i(Vt1)*I(Vt1))/v(m)
Bs2 0 m i=0.67395059 *v(m)*ln(1e-60 +5220.1829*i(Vt1)
+54033309*i(Vt1)*i(Vt1)+
+ 7.5333001e +10*i(Vt1)*i(Vt1) *i(Vt1))/(1+0.95928574 *v(m)*v(m))
Bpf pf 0 v=v(m)*v(m)
.ends ltest1
.model d1mod_ltest1 D Is=3.6641713e-14 n=2
.model d2mod_ltest1 D Is=3.6641713e-14 n=2 tt=1.8181818e-08
************************************************************************
.dc ibias 0 50m 0.25m
.end
Third of three vertically aligned + signs was absent from original, and is
vital unless you merge that line to the end of the previous one.) I made a
symbol file for LTspice to use this model:
Version 4
SymbolType CELL
LINE Normal -12 -40 -12 -24
LINE Normal -20 -32 -4 -32
LINE Normal -20 32 -4 32
LINE Normal -28 32 -48 32
LINE Normal -28 -32 -48 -32
LINE Normal 76 0 96 0
LINE Normal 48 -16 -16 -16
LINE Normal 16 16 48 -16
LINE Normal -16 -16 16 16
LINE Normal 48 16 -16 16
SYMATTR Value ltest1
SYMATTR Prefix X
SYMATTR ModelFile LD_TEST.sub
SYMATTR Value2 ltest1
SYMATTR Description Unknown laser diode model.
PIN -48 -32 NONE 0
PINATTR PinName PIN+
PINATTR SpiceOrder 1
PIN -48 32 NONE 0
PINATTR PinName PIN-
PINATTR SpiceOrder 2
PIN 96 0 NONE 0
PINATTR PinName OUT
PINATTR SpiceOrder 3
Ignore the terrible graphic if you try this, it was a rough edit of one of my
op-amp symbols, it was the fastest way to make something useable...
Anyway, it's an odd result! If I make a simple LM317 based constant current
driver circuit (I have a good LM317 model now) and set the current for 152 mA
using an 8R2 resistor, the current is steady but at more current than it
should be! The model appears to be generating virtual energy.
Worse, a voltage plot of the anode end shows a rediculous curve, a relaxation
oscillator type sawtooth varying once every 50 microseconds, and between 0V
(Ground) and MINUS 12 KILOVOLTS! That can NOT be right...
I really don't think I'm going to use this. And I suspect we wouldn't have to
be bombed back to the stone age, or even to the technical levels current when
the Alexandria Library was burned, to render that document as arcane as one
of Harry Potter's spells. It's obviously not meant for the purpose I'm trying
to put it to even if by a wild fluke I can figure out how to make it work
right, and I don't think I even have leave to SEE it, technically, so I ask
yet again, please can someone help me to find how to adapt a standard diode
model to emulate a laser diode, electrically, well enough to design simple
drivers for? I need to see if learning SPICE is going to be useful. So far I
notive very different behaviour depending on whether I use 4 series 1N4005's
or 4 series 1N4148's, so clearly I do need something better than plugging in
the first diodes I can find.
A
Archimedes' Lever
Guest
On Mon, 27 Jul 2009 15:07:43 -0700, Bruce L. Bergman
<bruceNOSPAMbergman@gmail.com> wrote:
We build power supplies, and we build them to spec (built).
So a customer wanted that input, so we put that in our Lab.
Not only could we work with that voltage, but we could also built and
test units that required more than standard service provisos.
Also, I do not believe that it is "Oddball" in El Cajon, CA.
<bruceNOSPAMbergman@gmail.com> wrote:
Wrong. WE had it installed.
We build power supplies, and we build them to spec (built).
So a customer wanted that input, so we put that in our Lab.
Not only could we work with that voltage, but we could also built and
test units that required more than standard service provisos.
Also, I do not believe that it is "Oddball" in El Cajon, CA.
L
Lostgallifreyan
Guest
Kai-Martin Knaak <kmk@lilalaser.de> wrote in
newsan.2009.07.28.02.24.20@lilalaser.de:
I'm after trying something very specific, something I was
often told wouldn't work well but has often exceeded expectations so I want
to see how far it goes.. I'm modulating up to 500 MHz, DC coupled, with
constant regulated current held in linear proportion to an input control
voltage between 0 and 5 volts, with independent control of threshold level.
I have no illusions about spice. I've always preferred to model ideas as
parts on boards, but having seen LTspice mentioned a lot, I started looking
at it, and decided to learn something new because like SketchUp for basic
aid in visualising hardware constructions, this should save a lot of time
eventually.
I found that my FIRST attempt to model my driver showed me details I saw on a
100 MHz scope many months ago, so it's obviously damn close to the mark. I
was modulating at just 100 KHz then, trying to see if I could out-do Robin
Bowden's Die4drive. (Does 200 KHz with no overshoot but with wave peaks
far less flat than I want over their duration at that speed). The spice model
showed that some resistor changes were enough to increase stability to allow
500 KHz modulation with sharp transitions, flat peaks, AND no overshoot, (and
well over 1 MHz if I don't mind blunting the sharp edges and rounding the
peaks a bit), and at those frequencies you can bet it DOES matter what diode
properties there are if you're trying to keep sharp edges... in general I
notice from models that those diodes which do not vary their Vf much with
sharp changes from 0 drive to full drive are also those most prone to ringing
and overshoot on the rising edge.
Right now I'm about 24 hours overdue for sleep and past feeling tired but I'm
going to try to get some. I've started trying some LED models that are as
close as anything yet. They have forward voltage similar to a laser diode,
similar average currents, and they produce roughly the expected kinds of
waveforms. Maybe this is enough closeness, so if during my sleep people
shower my posts liberally with spice models of high-brightness red GaAlAs
LED's as well as laser diodes, I'll be very happy to see them in how ever
many hours it takes me to be fit to look at them.
And as a hint, my diode driver is a modification of one I posted here often,
in turn based on an idea in the LaserFAQ, posted originally by Winfield Hill.
His wouldn't have accepted a control voltage though, that bit was mine.
news
an.2009.07.28.02.24.20@lilalaser.de:Several times.
I'm after trying something very specific, something I was often told wouldn't work well but has often exceeded expectations so I want
to see how far it goes.. I'm modulating up to 500 MHz, DC coupled, with
constant regulated current held in linear proportion to an input control
voltage between 0 and 5 volts, with independent control of threshold level.
I have no illusions about spice. I've always preferred to model ideas as
parts on boards, but having seen LTspice mentioned a lot, I started looking
at it, and decided to learn something new because like SketchUp for basic
aid in visualising hardware constructions, this should save a lot of time
eventually.
I found that my FIRST attempt to model my driver showed me details I saw on a
100 MHz scope many months ago, so it's obviously damn close to the mark. I
was modulating at just 100 KHz then, trying to see if I could out-do Robin
Bowden's Die4drive.
(Does 200 KHz with no overshoot but with wave peaks far less flat than I want over their duration at that speed). The spice model
showed that some resistor changes were enough to increase stability to allow
500 KHz modulation with sharp transitions, flat peaks, AND no overshoot, (and
well over 1 MHz if I don't mind blunting the sharp edges and rounding the
peaks a bit), and at those frequencies you can bet it DOES matter what diode
properties there are if you're trying to keep sharp edges... in general I
notice from models that those diodes which do not vary their Vf much with
sharp changes from 0 drive to full drive are also those most prone to ringing
and overshoot on the rising edge.
Right now I'm about 24 hours overdue for sleep and past feeling tired but I'm
going to try to get some. I've started trying some LED models that are as
close as anything yet. They have forward voltage similar to a laser diode,
similar average currents, and they produce roughly the expected kinds of
waveforms. Maybe this is enough closeness, so if during my sleep people
shower my posts liberally with spice models of high-brightness red GaAlAs
LED's as well as laser diodes, I'll be very happy to see them in how ever
many hours it takes me to be fit to look at them.
And as a hint, my diode driver is a modification of one I posted here often,
in turn based on an idea in the LaserFAQ, posted originally by Winfield Hill.
His wouldn't have accepted a control voltage though, that bit was mine.
K
Kai-Martin Knaak
Guest
On Mon, 27 Jul 2009 19:09:42 -0500, Lostgallifreyan wrote:
the properties of the diode. Unless you intend to do some very high
bandwidth modulation, any diode should do in the simulation.
There's no need to reinvent the wheel here. Did you check the collection
of laser diode drivers in sam's laserfaq?
---<(kaimartin)>---
--
Kai-Martin Knaak
Ăffentlicher PGP-SchlĂźssel:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53
Whatever circuit you are going to use, it shouldn't be that sensitive to
the properties of the diode. Unless you intend to do some very high
bandwidth modulation, any diode should do in the simulation.
There's no need to reinvent the wheel here. Did you check the collection
of laser diode drivers in sam's laserfaq?
---<(kaimartin)>---
--
Kai-Martin Knaak
Ăffentlicher PGP-SchlĂźssel:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53
T
The Great Attractor
Guest
On Tue, 28 Jul 2009 23:52:35 -0700 (PDT), Proteus IIV
<proteusiiv@gmail.com> wrote:
<proteusiiv@gmail.com> wrote:
You're an idiot.
P
Proteus IIV
Guest
On Jul 27, 8:39 pm, Archimedes' Lever <OneBigLe...@InfiniteSeries.Org>
wrote:
YOU ARE NOT GOING TO GET AWAY WITH THOSE OFF COLORED COMMENTARIES AND
DIRTY POST YOU MADE AT ALT.E.E TROLL
I AM PROTEUS
wrote:
IDIOT ?? FUCKING RETARD ??
YOU ARE NOT GOING TO GET AWAY WITH THOSE OFF COLORED COMMENTARIES AND
DIRTY POST YOU MADE AT ALT.E.E TROLL
I AM PROTEUS
P
Proteus IIV
Guest
On Jul 27, 8:26 pm, Archimedes' Lever <OneBigLe...@InfiniteSeries.Org>
wrote:
WE GOT YOUR GREAT ATTRACTER ACCOUNT THIS ONE IS NEXT
I AM PROTEUS
wrote:
YOU CROSS POSTING LOW LIFE GET GOING
WE GOT YOUR GREAT ATTRACTER ACCOUNT THIS ONE IS NEXT
I AM PROTEUS
L
Lostgallifreyan
Guest
If anyone is following this and wants to try modelling their own stuff, I
found what might be a way.
Intusoft make a tool called SpiceMod which is part of a package they call
ICAP4 though it seems the demo setup doesn't have that tool, just some very
good noted on it, and modelling in general:
The file WkwModels.pdf from the demo install answers a lot fo the questions I
had about modelling diodes, which parameters to tweak, and extraction from
data sheets.
I don't know if the lack of response to me is because of a thousand experts
silently screming RTFM at me, or because it's actually asomething they DON'T
KNOW. Given that Intusoft explain that this is a serious challenge for
experts too, I'm assuming maybe they really don't know, so they might benefit
from that file as much as I will.
found what might be a way.
Intusoft make a tool called SpiceMod which is part of a package they call
ICAP4 though it seems the demo setup doesn't have that tool, just some very
good noted on it, and modelling in general:
The file WkwModels.pdf from the demo install answers a lot fo the questions I
had about modelling diodes, which parameters to tweak, and extraction from
data sheets.
I don't know if the lack of response to me is because of a thousand experts
silently screming RTFM at me, or because it's actually asomething they DON'T
KNOW. Given that Intusoft explain that this is a serious challenge for
experts too, I'm assuming maybe they really don't know, so they might benefit
from that file as much as I will.
J
Joerg
Guest
Lostgallifreyan wrote:
Most of us just use a regular diode to simulate because all one
(usually) wants to know is that there definitely won't be any ever so
slight spike in diode current because LDs can go poof in microseconds.
Simulating the optics part would be a major challenge, I think.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
Most of us just use a regular diode to simulate because all one
(usually) wants to know is that there definitely won't be any ever so
slight spike in diode current because LDs can go poof in microseconds.
Simulating the optics part would be a major challenge, I think.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
L
Lostgallifreyan
Guest
Joerg <invalid@invalid.invalid> wrote in
news:7dbdd3F2b0r74U2@mid.individual.net:
I agree, same here, that's all I
usually need too, though like that EDN manual says, a more detailed model
that allows models to give warning of imminent demise is useful. Modelling
for ESD is likely daft, better that we just take care and put in TVS's and
such, but when it comes to fast modulation, a model definitely helps. Surely
you'd have a use for that, no?
While I found that a string of four 1N4148's produced a modelled overshoot
almost exactly like what I saw on an oscilloscope months before I considered
looking at spice, I got a very different result when trying four 1N4001's so
it really does need something better than reaching for a standard diode, in a
model OR as a dummy diode in a real circuit (where a optically dead laser
diode is best anyway). So it really comes down to trying to get something
usefully close! EDN's model seems ideal, aimed at solving this problem for
general use, as opposed to the elaborate models in private university
publications. EDN's is probably tested too, proofread and verified before
publishing.
http://www.e-insite.net/ednmag/archives/1998/071698/pdf/15di.pdf
(Halfway through file).
If anyone can help by making that into asy and sub files for LTspice it will
help me a lot, and probably a lot of other people too. Four days of searching
have found lots of other people askign questions, and very few answers, and
NONE complete and verified. Someone could get well known for solving this so
other people can have an easier time of it.
news:7dbdd3F2b0r74U2@mid.individual.net:
Thought that might provoke an expert.
I agree, same here, that's all I usually need too, though like that EDN manual says, a more detailed model
that allows models to give warning of imminent demise is useful. Modelling
for ESD is likely daft, better that we just take care and put in TVS's and
such, but when it comes to fast modulation, a model definitely helps. Surely
you'd have a use for that, no?
While I found that a string of four 1N4148's produced a modelled overshoot
almost exactly like what I saw on an oscilloscope months before I considered
looking at spice, I got a very different result when trying four 1N4001's so
it really does need something better than reaching for a standard diode, in a
model OR as a dummy diode in a real circuit (where a optically dead laser
diode is best anyway). So it really comes down to trying to get something
usefully close! EDN's model seems ideal, aimed at solving this problem for
general use, as opposed to the elaborate models in private university
publications. EDN's is probably tested too, proofread and verified before
publishing.
http://www.e-insite.net/ednmag/archives/1998/071698/pdf/15di.pdf
(Halfway through file).
If anyone can help by making that into asy and sub files for LTspice it will
help me a lot, and probably a lot of other people too. Four days of searching
have found lots of other people askign questions, and very few answers, and
NONE complete and verified. Someone could get well known for solving this so
other people can have an easier time of it.
L
Lostgallifreyan
Guest
In case anyone wants to try making a model, I typed out that netlist and
checked it carefully, so this can save you a bit of time:
Vlas 100 50 1
Dlas 50 200 diode1
F1 0 1 Vlas 1
Rs 1 0 {Sm*sps}
I1 2 0 {Sm*sps*Ith*exp((T/25)-1)}
G1 0 2 1 0 1
Rlim 2 0 1Meg
Ds 2 3 diode
Vm 3 0 0
F2 300 400 Vm 1
Dmon 300 400 diode
Cmon 300 400 Cmon
..model diode d
..model diode d rs=5
..ENDS
But it obviously needs more than that to build a subcircuit file. I don't
know how yet, or even if the 'figure 1' in that PDF has all the required
detail to make it possible.
checked it carefully, so this can save you a bit of time:
Vlas 100 50 1
Dlas 50 200 diode1
F1 0 1 Vlas 1
Rs 1 0 {Sm*sps}
I1 2 0 {Sm*sps*Ith*exp((T/25)-1)}
G1 0 2 1 0 1
Rlim 2 0 1Meg
Ds 2 3 diode
Vm 3 0 0
F2 300 400 Vm 1
Dmon 300 400 diode
Cmon 300 400 Cmon
..model diode d
..model diode d rs=5
..ENDS
But it obviously needs more than that to build a subcircuit file. I don't
know how yet, or even if the 'figure 1' in that PDF has all the required
detail to make it possible.
J
Joerg
Guest
Lostgallifreyan wrote:
be one. TVS don't work well. Their cutoff isn't terribly well defined
and they have too much capacitance for this. Just handle the things with
care. I've never killed one with ESD, knock on wood ;-)
Some of the 4000 series behave more like PIN diodes.
It's going to be lots of work. You'll need to get into behavioral models
and while people have modeled large chunks of jet engines with that it
was a ton of work.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
I have designed LD circuitry but I am not an expert. Senor Hobbs wouldJoerg <invalid@invalid.invalid> wrote in
news:7dbdd3F2b0r74U2@mid.individual.net:
Lostgallifreyan wrote:
If anyone is following this and wants to try modelling their own stuff,
I found what might be a way.
Intusoft make a tool called SpiceMod which is part of a package they
call ICAP4 though it seems the demo setup doesn't have that tool, just
some very good noted on it, and modelling in general:
The file WkwModels.pdf from the demo install answers a lot fo the
questions I had about modelling diodes, which parameters to tweak, and
extraction from data sheets.
I don't know if the lack of response to me is because of a thousand
experts silently screming RTFM at me, or because it's actually
asomething they DON'T KNOW. Given that Intusoft explain that this is a
serious challenge for experts too, I'm assuming maybe they really don't
know, so they might benefit from that file as much as I will.
Most of us just use a regular diode to simulate because all one
(usually) wants to know is that there definitely won't be any ever so
slight spike in diode current because LDs can go poof in microseconds.
Simulating the optics part would be a major challenge, I think.
Thought that might provoke an expert.
usually need too, though like that EDN manual says, a more detailed model
that allows models to give warning of imminent demise is useful. Modelling
for ESD is likely daft, better that we just take care and put in TVS's and
such, but when it comes to fast modulation, a model definitely helps. Surely
you'd have a use for that, no?
be one. TVS don't work well. Their cutoff isn't terribly well defined
and they have too much capacitance for this. Just handle the things with
care. I've never killed one with ESD, knock on wood ;-)
"File not found" :-(
Some of the 4000 series behave more like PIN diodes.
It's going to be lots of work. You'll need to get into behavioral models
and while people have modeled large chunks of jet engines with that it
was a ton of work.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.