Software
It makes a big difference. In PV mode, diode series resistance will limit current a lot sooner than it will limit current when the diode is back-biased.
Small-spot illumination in PV mode is the worst.
John
Software
You could possibly test that, like so:
Take a strong lamp with a dimmer. Mount two of those PDs but put a strong attenuating material in front of one. Something that cuts down the PD current by a factor of 10 or more. The attenuated one would then operate in its linear range while the open PD gets the full brunt. Now crank up the dimmer and see if and where the ratio between the two begins to change.
If done by his book it has to be perfect :-)
-- Regards, Joerg http://www.analogconsultants.com/
Customer who wants to control light level, and do so fast, actually.
-- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com
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Thanks, most of the time I'm groveling in the uA range. When I designed it I didn't even know how make a quite power supply for biasing.
(Are you ever embarrassed by your old designs?)
George H.
Wouldn't it be easier just to filter the input, rather than desensitize the detector?
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oYeah I did something like that. I had a laser and a piece of glass, about 10% reflection and 90% transmission, so with a detector on each side you are set to go.
Hmm nothing I ever do is perfect.
George H.
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Is there a problem contacting the manufacturer?
Do you need the blue enhanced response? Blue-enhanced photodiodes have very thin epi, which makes for lots of lateral voltage drop at higher photocurrents.
It's almost certainly good for a milliamp with reasonable lineearity anyway. A similar device that I'm quite fond of is the SFH206.
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 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
[...]
Ah, so you must be married, too :-)
-- Regards, Joerg http://www.analogconsultants.com/
That one isn't running out of carriers, it's running out of bias voltage. Check the top of the curve--R_L=100K, so it flatlines at 50 uA at 5V bias.
You can get into high level injection limits, but not at 50 uA.
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 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
The TAOS and Intersil sensors are reasonable, but very very slow. For controlling light bulbs, they're probably fine--that's more or less what they're designed for.
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 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
You know the rules...
(1) The boss is always right
(2) When the boss is wrong refer to Rule (1)
It's really easy once you understand the rules... coming up soon, 52nd anniversary ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| 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.
Software
No. Other than I can't remember why I did it that way ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| 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.
Behind every great man is a woman rolling her eyes.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Software
Well, sort of. Some things were grossly inelegant, in that later versions were much better.
When I was just a kid, I did classic amateur hairball asynchronous logic design. This pulse fired that one-shot which hit that flipflop, counters cleared themselves, unijunctions fired, nightmares like that. Heck, DEC designed the PDP8 that way, a mess of RCs and delay lines and start-stop clocks and junk running around in circles. One day a kind soul inducted me into the Church of Synchronous Design. But I still do an async trick now and then.
John
As you know personally, Naomi rolls her eyes a lot ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| 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.
Software
Oh yeah, the first PDP-11 was an async mess. You could toggle in a short program that locked it up.
John
And an astounded mother-in-law. ;)
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 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
Yeah, but I think I'm my worst critic, My wife is fairly forgiving... Thank God*
George H.
*I'm mostly agnostic, so I'm allowed to invoke God 1/2 the time.
/PDB-
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My only excuse is that I didn't know better, at the time.
Honesty is only way to go.
George H.
=A0 =A0 ...Jim Thompson
=A0 =A0| =A0 =A0mens =A0 =A0 |
=A0 | =A0 =A0 et =A0 =A0 =A0|
=A0|
=A0 =A0 =A0 |
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