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> 1 GHz DIY differential probes
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Marco:

--- Quote from: Gerhard_dk4xp on October 21, 2018, 10:57:20 am ---Discontinued.

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Such a shame too. Some of those Broadcomm pHEMT's go up to a transconductance of 2000 mS, there's nothing else like them in the discrete world.
nctnico:

--- Quote from: Marco on October 29, 2018, 12:58:06 pm ---
--- Quote from: Gerhard_dk4xp on October 21, 2018, 10:57:20 am ---Discontinued.

--- End quote ---
Such a shame too. Some of those Broadcomm pHEMT's go up to a transconductance of 2000 mS, there's nothing else like them in the discrete world.

--- End quote ---
Off topic: IMHO it is a major PITA that Broadcom is killing all the nice RF parts from HP/Agilent/Avago. Also a lot of opto stuff is being discontinued.  :wtf:
LapTop006:

--- Quote from: nctnico on October 29, 2018, 02:14:55 pm ---Off topic: IMHO it is a major PITA that Broadcom is killing all the nice RF parts from HP/Agilent/Avago. Also a lot of opto stuff is being discontinued.  :wtf:

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Given how hard it is to be able to purchase or even just get real datasheets for their parts that might actually be the better option, at least now a competitor knows they have a good chance at picking up customers.
Marco:
High GHz discrete RF is such a niche that probably no one will pick them up. CEL and Skyworks will probably keep producing their parts for a while, but those just don't compare to Broadcomm's as far as transconductance is concerned. I don't see them developing ones to rival Broadcomm's ... gone with the wind now.
nctnico:
Today I had some time to put a new board with the LMH3401 together. The differential impedance is 2k Ohm with a 1:20 attenuation. I'm contemplating having a 1:50 version with 5k Ohm differential input impedance but that is for later. Some initial testing shows promising results:



This is with the input normal and reversed so it should give an idea on how good the common mode amplification is. I'll need to do a whole lot more testing but for that I need to finish the rest of the board first. This is just the amplifier (and 0402 decoupling capacitors) powered from a bench PSU.
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