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> 1 GHz DIY differential probes
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KE5FX:

--- Quote from: alfredr on September 05, 2018, 06:53:58 am ---Hi, my name is Alfred Rosenkraenzer.
I am the designer of this active high speed probe described in Elektor 2016. This version is no longer available, but there is a new one described in ELEKTOR 3/2017(DE) using a USB power supply. The analog specs are similiar.
I am selling loaded and tested pcb and finished probes (no blank boards). More info under alfred_rosenkraenzer@gmx.de

--- End quote ---

Nice.  Is that an LMH5401?
nctnico:

--- Quote from: alfredr on September 05, 2018, 06:53:58 am ---Hi, my name is Alfred Rosenkraenzer.
I am the designer of this active high speed probe described in Elektor 2016. This version is no longer available, but there is a new one described in ELEKTOR 3/2017(DE) using a USB power supply. The analog specs are similiar.
I am selling loaded and tested pcb and finished probes (no blank boards). More info under alfred_rosenkraenzer@gmx.de

--- End quote ---
Very interesting. Do you have some kind of datasheet? Also, why are you using RG316? In my experience this is already quite lossy at 'only' 1 GHz.
alfredr:
No, it is an Analog Devices ADA4927-1. It gives you about 2 GHz bandwidth (-3dB). The differential input impedance is about 5.1 KOhm
The LMH5401 gives you even more bandwidth (maybe up to 4 GHz) but it lowers the input impedance even more.
I use the LMH5401 in another application, but I did not test it for a probe.
The higher bandwidth might not be usefull for most people since you need a expensive scope.
There is a description with specs attached.
I use the RG316 to stay at an affordable price.
nctnico:
And what would the price be when using better coax? 1 meter of RG316 gives a loss of 1.2dB at 1GHz which is an amplitude error of around 15%. I could use this probe but I would like to have the best possible frequency response.
alfredr:
I would propose you buy the loaded board and the housing (drilled holes and added connectors if you like) and install whatever cable you like.
The USB cable should not be aproblem
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