Re: photodiode shunt resistance equation

"Wanderer" <wanderer@xxxxxxxxxxxxxxx> schrieb im Newsbeitrag
news:a9984eb5-ba04-47c5-997c-261b7ab375b2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Feb 24, 1:05 am, Phil Hobbs <pcdhSpamMeSensel...@xxxxxxxxxxxx>
wrote:
Wanderer wrote:
On Feb 23, 4:47 pm, MooseFET <kensm...@xxxxxxxxx> wrote:
On Feb 23, 9:46 am, Wanderer <wande...@xxxxxxxxxxxxxxx> wrote:

What is the equation for the photodiode shunt resistance relation
with
temperature? I know it's logarithmic and got kT/q in it but I can't
seem to find it.
Look for the (non-photo)diode equation.

Thanks for the reply. It's probably that simple and staring me in the
face. I know the diode equation I don't see how to relate it to photo
diode shunt resistance so I can get the shunt resistance noise. If I
use ohms law and the bias voltage is zero I'm back to square one.

At one point Aldert Van der Ziel in his book converts the dark current
noise into a conductance to simply his model.

Idark * q/2kT

Is that 1/Rshunt? Is the shunt resistance just a different way to
write the dark current noise?

Thanks

Dark current noise in photodiodes is almost never the limiting noise
source in a measurement. What are you actually trying to measure?

Cheers,

Phil Hobbs


I'm building an incoming inspection tool for one of these

http://jp.hamamatsu.com/products/division/ssd/pd041/pd064/pd065/S9295-01/index_en.html

I'm computing the noise through a power spectral density matlab
program. I see the dark current drop like it is suppose to, but I only
get 6% change in noise from 25C to 5C. I'm told I should see a much
greater change because of cooling the shunt resistance. I know it's
just some bugs in my code, but I'd like to do some calculations to get
an idea of expected results.

Thanks

Hello,

How do you calculate the noise?

Is it the integrated noise voltage over a certain bandwidth?

What's the lower and upper frequency limit of your
measurement and noise calculation?

I remember that Rshunt will fall by a factor of two
for every temperature rise of 6 to 10 degree.

Best regards,
Helmut





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