Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ig!ames!amdcad!rpw3
From: rpw3@amdcad.AMD.COM (Rob Warnock)
Newsgroups: sci.electronics
Subject: Re: High Speed LED
Message-ID: <25390@amdcad.AMD.COM>
Date: 25 Apr 89 02:13:56 GMT
References: <13865@louie.udel.EDU>
Reply-To: rpw3@amdcad.UUCP (Rob Warnock)
Organization: [Consultant] San Mateo, CA
Lines: 23

In article <13865@louie.udel.EDU> berryh@udel.EDU (John Berryhill) writes:
+---------------
| Can someone out there tell me the speed of the fastest AlGaAs/GaAs
| IR LED that is commercially available.  I've got plenty of references
| to laboratory devices approaching 1 GHz, but I'd like to know who
| makes the fastest commercial device and how fast it goes.  I'm
| only interested in LED's, not lasers.  | Thank you.
+---------------

Well, I don't know about "fastest", but some rather inexpensive (by
comparison to the market) plastic-packaged 820 nm LEDs from H-P will
do *at least* 150 Mb/s...  Is that fast enough?

Note: The problem is usually not the LED itself, but the driver circuit.
H-P's app note "AB-78" shows several ways to drive a LED at 150 Mb/s.


Rob Warnock
Systems Architecture Consultant

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