Hi there - I was thinking about trying to design a laser driver over
the weekend. Unfortunately, I can't seem to find a spice model for a
laser diode, putting a bit of a squabash on that plan.

Anybody know where I can find one? Ideally I'd find one for a very
normal ~5mw red laser diode - like those you'd find in a cheap laser
pointer.

Thanks!

-Michael

Michael wrote:
> Hi there - I was thinking about trying to design a laser driver over
> the weekend. Unfortunately, I can't seem to find a spice model for a
> laser diode, putting a bit of a squabash on that plan.
>
> Anybody know where I can find one? Ideally I'd find one for a very
> normal ~5mw red laser diode - like those you'd find in a cheap laser
> pointer.

 I created a spice model for a purple laser diode,
 complete with it's optical sensor.

On Sat, 26 Jan 2008 05:29:39 -0800 (PST), Michael <n...@gmail.com>
wrote:

>Hi there - I was thinking about trying to design a laser driver over
>the weekend. Unfortunately, I can't seem to find a spice model for a
>laser diode, putting a bit of a squabash on that plan.
>
>Anybody know where I can find one? Ideally I'd find one for a very
>normal ~5mw red laser diode - like those you'd find in a cheap laser
>pointer.
>
>Thanks!
>
>-Michael
http://www.cadence.com/appnotes/ModelingPhotodiodesLEDsandLaserDiodes.zip

Heres an application note with some wxample models included.

On Jan 26, 9:47=A0am, Winfield <winfieldh...@yahoo.com> wrote:
> Michael wrote:
> > Hi there - I was thinking about trying to design a laser driver over
> > the weekend. Unfortunately, I can't seem to find a spice model for a
> > laser diode, putting a bit of a squabash on that plan.
>
> > Anybody know where I can find one? Ideally I'd find one for a very
> > normal ~5mw red laser diode - like those you'd find in a cheap laser
> > pointer.
>
> =A0I created a spice model for a purple laser diode,
> =A0complete with it's optical sensor.

Hi Winfield - out of curiosity, how would a purple laser diode differ
from a red laser diode? (besides the outputted color :0 )

Thanks,

-Michael

On Jan 26, 10:06=A0am, Hammy <spa...@hotmail.com> wrote:
> On Sat, 26 Jan 2008 05:29:39 -0800 (PST), Michael <nleah...@gmail.com>
> wrote:
>
> >Hi there - I was thinking about trying to design a laser driver over
> >the weekend. Unfortunately, I can't seem to find a spice model for a
> >laser diode, putting a bit of a squabash on that plan.
>
> >Anybody know where I can find one? Ideally I'd find one for a very
> >normal ~5mw red laser diode - like those you'd find in a cheap laser
> >pointer.
>
> >Thanks!
>
> >-Michael
>
> http://www.cadence.com/appnotes/ModelingPhotodiodesLEDsandLaserDiodes...
>
> Heres an application note with some wxample models included.

Hi - Do you know how to import their part into LTspice? My only
experience with spice is with using the built in library components -
I've never had to work with the actual text files themselves :o

-Michael

On Sat, 26 Jan 2008 05:29:39 -0800 (PST), Michael <n...@gmail.com>
wrote:

>Hi there - I was thinking about trying to design a laser driver over
>the weekend. Unfortunately, I can't seem to find a spice model for a
>laser diode, putting a bit of a squabash on that plan.


Does not having a Spice model stop the project dead? I wonder how TVs
and Radar were invented.

John

Hammy wrote:
> 
> On Sat, 26 Jan 2008 05:29:39 -0800 (PST), Michael <n...@gmail.com>
> wrote:
> 
> >Hi there - I was thinking about trying to design a laser driver over
> >the weekend. Unfortunately, I can't seem to find a spice model for a
> >laser diode, putting a bit of a squabash on that plan.
> >
> >Anybody know where I can find one? Ideally I'd find one for a very
> >normal ~5mw red laser diode - like those you'd find in a cheap laser
> >pointer.
> >
> >Thanks!
> >
> >-Michael
> http://www.cadence.com/appnotes/ModelingPhotodiodesLEDsandLaserDiodes.zip
> 
> Heres an application note with some wxample models included.

Any good reason that I have to have Flash installed to download this?

-- 
Paul Hovnanian	p...@hovnanian.com
-----------------------------------------------------------------------
Procrastinators: The leaders for tomorrow.

On Jan 26, 12:35 pm, Michael <nleah...@gmail.com> wrote:
> On Jan 26, 9:47 am, Winfield <winfieldh...@yahoo.com> wrote:
>
> > Michael wrote:
> > > Hi there - I was thinking about trying to design a laser driver over
> > > the weekend. Unfortunately, I can't seem to find a spice model for a
> > > laser diode, putting a bit of a squabash on that plan.
>
> > > Anybody know where I can find one? Ideally I'd find one for a very
> > > normal ~5mw red laser diode - like those you'd find in a cheap laser
> > > pointer.
>
> >  I created a spice model for a purple laser diode,
> >  complete with it's optical sensor.
>
> Hi Winfield - out of curiosity, how would a purple laser diode differ
> from a red laser diode? (besides the outputted color :0 )

 MUCH higher forward voltage - the band-gap voltage for
 short-wavelength photons is much higher, because each
 photon has much more energy.  Also, every type of laser
 diode will have its own plot - the laser-light output
 is very nonlinear with current, and you want the spice
 model to properly show that effect.  Also, whatever you
 get, I wouldn't trust the model until I had verified it
 on the bench.

John Larkin wrote:
> 
> On Sat, 26 Jan 2008 05:29:39 -0800 (PST), Michael <n...@gmail.com>
> wrote:
> 
> >Hi there - I was thinking about trying to design a laser driver over
> >the weekend. Unfortunately, I can't seem to find a spice model for a
> >laser diode, putting a bit of a squabash on that plan.
> 
> Does not having a Spice model stop the project dead? I wonder how TVs
> and Radar were invented.
> 
> John

Someone just downloaded the application notes PDF and used an example
circuit? ;-)

-- 
Paul Hovnanian	p...@hovnanian.com
-----------------------------------------------------------------------
Procrastinators: The leaders for tomorrow.

"Michael" <n...@gmail.com> schrieb im Newsbeitrag 
news:9...@i29g2000prf.googlegroups.com...
On Jan 26, 10:06 am, Hammy <spa...@hotmail.com> wrote:
> On Sat, 26 Jan 2008 05:29:39 -0800 (PST), Michael <nleah...@gmail.com>
> wrote:
>
> >Hi there - I was thinking about trying to design a laser driver over
> >the weekend. Unfortunately, I can't seem to find a spice model for a
> >laser diode, putting a bit of a squabash on that plan.
>
> >Anybody know where I can find one? Ideally I'd find one for a very
> >normal ~5mw red laser diode - like those you'd find in a cheap laser
> >pointer.
>
> >Thanks!
>
> >-Michael
>
> http://www.cadence.com/appnotes/ModelingPhotodiodesLEDsandLaserDiodes...
>
> Heres an application note with some wxample models included.

Hi - Do you know how to import their part into LTspice? My only
experience with spice is with using the built in library components -
I've never had to work with the actual text files themselves :o

-Michael


Hello Michael,

Inside this zip-file is a model file laser_diode.lib .
It contains a line .model dlaser D(...)
Nothing great (Is=5e-37 N=1 ....). I doubt it's realistic,
but it doesn't matter for your application. Just use it as it is.

Best regards,
Helmut