Electronics > Projects, Designs, and Technical Stuff
Looking for Cheap, Ultra Fast LEDs (2-3ns)
technix:
What for though? Is it ultra-fast display? Fiber optics?
If it is the former, I have nothing. If it is the latter, maybe you can use a ready-made module (TOSLINK transmitter for slower ones, SFP+ module for something that is real fast) and just focus on the digital logic part. If your source chip has serdes, it is likely you can get SFP+ would work with that.
supperman:
--- Quote from: Marco on January 28, 2020, 07:11:51 pm ---Fast ADCs are ridiculously overpriced ... maybe PPM/PWM can get you a little more out of a single channel.
--- End quote ---
Agree.. dug a little deeper.. like $3.5 per channel at 8 bit and 100msample. One could probably get 2-3 bits per sample of data sampling both amplitude and frequency shifts (amplitude at the crossing point) on a carrier wave.... so 400mbit+ but it really busts the budget.
supperman:
--- Quote from: technix on January 28, 2020, 07:26:28 pm ---What for though? Is it ultra-fast display? Fiber optics?
If it is the former, I have nothing. If it is the latter, maybe you can use a ready-made module (TOSLINK transmitter for slower ones, SFP+ module for something that is real fast) and just focus on the digital logic part. If your source chip has serdes, it is likely you can get SFP+ would work with that.
--- End quote ---
This is for video transmission in a very specialized "air gaped" setup. I would just call it video.. not super fast or anything.. more than 1080p, less than 4k.. uncompressed.
dmendesf:
If you want to quantize in 4 steps (to double your data rate) you could try using the embedded LVDS receivers in the receiving FPGA as comparators. Crude but cheap. Of course this won't scale much more than that.
Marco:
--- Quote from: StillTrying on January 28, 2020, 01:12:29 am ---I think if any one here knows much about switching normal LEDs and photodiodes at these speeds they're keeping it to themselves.
--- End quote ---
The standard fast'ish cheap photodiode is SFH2701 ... the Chinese must have low cost faster photodiodes though, they sell Fiber->CATV converters for a couple bucks.
PS. actually they seem to be cheap ROSAs, not loose photodiodes. Less useful.
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