I'm wondering if anyone has a working design or knows of one for a DIY wideband (DC to > 1 GHz) DIY differential probe. I've search for this on and off, and found some attempts, but have not found a successful design. I have come across references to a 2 GHz design published in Elektor July/Aug 2015, but I don't have the article so I don't know if this is a working design or not. I'd buy the issue if I had some indication that this was indeed a working design.
I don't want to break Elektor's copyright, but this is the specs:
Technical specification
• Attenuation: 10:1 with a differential signal and 50 ? termination in the ‘scope
• Differential input resistance: 5 k?
• Single-ended input resistance: 2.5 k?
• Output resistance: 50 ?
• Bandwidth: 1.9 GHz (–3 dB)
• Rise/fall time: 300 ps
• Power supply: ±8 to 12 V DC.
They also write:
For readers who are interested the author
offers ready-to-use and tested PCB modules, also a kit consisting of case, RF cable
with BNC connector and power supply
lead with plug. Further information from:
alfred_rosenkraenzer@gmx.de.