<azonenberg>
10 MHz to 20 GHz, wow. this is for a single port i assume
<azonenberg>
Might be worth adding a VNA to our instrument-to-build list
<azonenberg>
Any word on expected pricing yet?
<azonenberg>
Also, general update - AKL-AD3 tip flex finally shipped, a week later than expected
<azonenberg>
should be able to assemble and test over the weekend
<d1b2>
<Darius> wonders how unobtainable they are
<d1b2>
<Darius> oh "preliminary", so very 😄
<d1b2>
<Darius> there is an application circuit for 2 port which uses 2 of them
<azonenberg>
Yeah. So a 4 port should be very achievable too
<azonenberg>
You could probably fit it in 1U or so
<azonenberg>
with room to spare
<azonenberg>
and i don't mean like a 1U pizza box, i mean like a 6" deep chassis
<d1b2>
<Darius> yeah
* GenTooMan
looks, "It appears they only have tested it thus far at 1GHz probably a convenient value"
<azonenberg>
I definitely would like to have a VNA on the instrument portfolio eventually
<azonenberg>
but it's not the highest proirity
<mxshift>
I have no other info. That datasheet showed up in another chat
<azonenberg>
Well, realistically i am not starting any new hardware design projects for quite a while
<azonenberg>
nor am i finishing most of my current ones
<azonenberg>
because components are impossible to source
<azonenberg>
i picked the perfect year to have a baby lol
<azonenberg>
all my projects are on hold anyway :P
<mxshift>
Heh
<azonenberg>
the probe stuff hasnt been hit too hard because i have plenty of passives, SMAs are reasonably easy to get
<azonenberg>
and while the LDOs I use on the differential probe are sold out on digikey mouser had enough i was able to buy them in reasonable bulk (ten units of each)
<azonenberg>
as well as several of the diff amplifiers
<azonenberg>
So i can do several more hardware iterations with stuff i have on hand
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<azonenberg>
So one thing... if i were to build a VNA around this
<azonenberg>
I would want to add relays to mux between the AD chip and a low frequency direct RF sampling frontend
<azonenberg>
so i can characterize response down to super low frequencies with a DDS synthesizer and ADC running at a couple hundred Msps
<azonenberg>
Not having response <10 MHz is an issue if you want to use the measured s-params for stuff like de-embedding of signals with significant low frequency content
<azonenberg>
like say a ddr ram bus with down time between read bursts
<d1b2>
<Darius> wouldn't you need a separate directional coupler then?
<azonenberg>
so i want a DC coupled path that can run down to kHz range
<azonenberg>
My thought is to have a SPDT RF relay
<azonenberg>
with one path going to the AD chip and one to my own low frequency path
<azonenberg>
No directional coupler, direct RF synthesis/sampling
<azonenberg>
It might be forward path only for that path (transmitted power, reflected power assumed zero)
<azonenberg>
as channel emulation and de-embedding only cares about the forward path and that's my main use for really low freq sparams
<azonenberg>
i just need attenuation and propagation delay of each freq as low as i can go
<d1b2>
<Darius> OK
<azonenberg>
But by measuring the TX waveform vs what i expect to see
<azonenberg>
i think i could get the reflected path that way too
<azonenberg>
Anyway, the diff probe, power rail probe, and at least one scope are coming first :p
<azonenberg>
last thing i need is another project at this point lol
<azonenberg>
Speaking of which the AKL-AD3 flex is finally on the way a week behind schedule
<azonenberg>
not sure what happened at oshpark
<d1b2>
<Darius> heh
<azonenberg>
Looks like it should be coming Friday around lunchtime
<azonenberg>
So i basically have from now until then to get the EMC shield paint on the prototype enclosure (eventually i'll want to test without it, but for now i'm keeping it)
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<azonenberg>
So I think i am going to refactor the Y axis units API slightly
<azonenberg>
in particular, i want to remove the restriction that multiple output streams of a channel have the same units
<azonenberg>
this would allow you to have things like mag/angle s-parameters be one channel
<azonenberg>
with two sub-streams
<azonenberg>
That's the immediate use case but I think there are other situations in which it would be helpful to be able to have two logically connected streams, or outputs from a filter, that are not the same units
<azonenberg>
but for example if i wanted to be able to add a filter that simulates a channel model and outputs mag/angle s-params, this would be super nice