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DC coupled 2.7 GHz Active Probe Project - Now Available!

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lasmux:
Also if you (or anyone else) do want to verify the probes performance, I'd be happy to loan you my prototype. Especially if you have a decent VNA to check the bandwidth, and fast scope to check the rise time.
I don't mind shipping it internationally.

lasmux:
I just ran this through my spice simulation again, and the rise time went from around 250ps to around 610ps, for a 1V rising edge or a 10V rising edge. These are just indications as my spice model isn't that similar to the actual performance of the probe. The spice version only has a bandwidth of 1.4GHz.

Edited with updated numbers.

hpw:

Well,

to measure the slew rate, consider Bodnar Fast Pulse and a DSO may with 10Gs and RIS...

I started with an active Probe from CalTest as CT4121 (now recognized that the ground to the probe tip is missing),
have also a 2.5G HPF and now a differential AP034.

All active probe have a certain connection pins, not fully side by side as yours, but love now my single AP034 :D

While you may simple connect an 2.54mm dual pin header as they are parallel and an additional GND pin on the side.

So easy to use 2..4 of them (as for I2S), leave them on the table along, without having the hands full of them. And turn with 2 hands on the DSO.

So my 2 cents on real measurement tasks

hp

lasmux:

--- Quote from: hpw on July 25, 2023, 07:55:16 pm ---to measure the slew rate, consider Bodnar Fast Pulse and a DSO may with 10Gs and RIS...

I started with an active Probe from CalTest as CT4121 (now recognized that the ground to the probe tip is missing),
have also a 2.5G HPF and now a differential AP034.
All active probe have a certain connection pins, not fully side by side as yours, but love now my single AP034 :D
While you may simple connect an 2.54mm dual pin header as they are parallel and an additional GND pin on the side.

--- End quote ---

That's a very fast rising edge from that pulse generator! If I manage to find a faster scope, I'll have a look at that, thanks.

tszaboo:
Looks cool. Those socket connectors at the end, are they the same size as the Agilent active probes?
For me it's a bit strange that you choose to have the 1M to be in series with the signal, those probes have a relatively small series resistance, and the 1M is used to shunt the 1pF. Any reason for that? Not judging, I'm genuinely curious, as I haven't built high speed scope probe yet, only high gain ones for shunt resistors.

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