![Quote](images/misc/quote_icon.png)
Originally Posted by
morgnk
I'm looking for high-speed SMD or through-hole photodiodes that are fast enough for ~32GHz bandwidth. The usual suppliers (Mouser,Digikey...) only seem to have 110ps rise time photodiodes which are only good for around 9GHz.
There are some suppliers of ready units but I'm just looking for the bare diodes. Are such diodes available for purchase or are they expensive components only sold to corporations?
![Quote](images/misc/quote_icon.png)
Originally Posted by
morgnk
I'm looking for high-speed SMD or through-hole photodiodes that are fast enough for ~32GHz bandwidth. The usual suppliers (Mouser,Digikey...) only seem to have 110ps rise time photodiodes which are only good for around 9GHz.
There are some suppliers of ready units but I'm just looking for the bare diodes. Are such diodes available for purchase or are they expensive components only sold to corporations?
Thorlabs has them down to 35 ps as a catalog item, and faster if you buy a "packaged" OEM part.
Consider the laboratory manufacturing process for 50 Ghz and low cost used to be :
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1. Buy a high speed microwave diode in a plastic pill package.
2. Solder it to a board with properly designed and matched microstrip.
3. Position a nanosecond pulsed laser based drill over the junction, basically a laser micromachining station.
4. Drill pulse by pulse till sufficient light response is just obtained by just barely burning through plastic and partially into the gold metallization.
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I think due to the chip sizes needed to keep junction size down and obtain good matching, it is a "Industry Only" part. HP/Agilent/Broadcom no longer makes the part number referenced in the "DIY" Review of Scientific Instruments paper.
The fiber optics industry gets them someplace, but that does not mean "Inexpensive"
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Good Luck...
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Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...