Re: Fast sampler

On Thu, 6 Mar 2025 12:33:35 -0800, Joerg <news@analogconsultants.com>
wrote:

On 3/6/25 8:29 AM, Bill Sloman wrote:

On 7/03/2025 3:06 am, john larkin wrote:

On Thu, 6 Mar 2025 10:54:20 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
>

On 2025-03-06 10:24, john larkin wrote:

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[...]
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When I was young and foolish, I used to do time delays with linear
ramps and ECL comparators.
>

>
The line receivers don't seem to have any significant amount of kickout,
either--we can sweep the Rx pulse across the Tx pulse with no apparent
funnies due to interaction.  Have you folks seen any kickout issues?
>
Of course the kickout might be delayed, I suppose.
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Cheers
>
Phil Hobbs

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We didn't test for that. When a comparator fires, all sorts of stuff
happens downstream, that could jostle adjacent channels.
>
Our comparators typically drive a 1 ns Tiny Logic flipflop as the next
step in the signal chain.
>
Standard ECL wasn't as fast as 15 cent Tiny parts are now.

 
But it's current steering logic and the supply rails stay a lot cleaner
than you see with CMOS switches.
 

>
Not a big problem, just place pillows around it, RC filters on the
supply. Drive was never an issue in my case but on rare occasions I have
used cheap signal transformers to isolate that.
>
The larger concern with supply rails is low frequency noise coming in,
causing phase noise. That is where capacitance multipliers can shine.

I measured one FPGA at around 1 mV per picosecond prop delay, on the 1
volt core supply. Prop delay is about inverse on voltage in cmos.

>
>

And what's Standard ECL now? It was Motorola 10k back when I was young,
and Motorola/Philips/Fairchild 100k a few years later. Motorola ECLinPs
took over a about when I stopped using it, about when I started posting
here, some twenty years ago.
 

>
AFAIK it's 100E but I have not used any in ages because I always found
them overpriced. I don't like it when two ICs cost more than a crate of
beer :-)

MC10EPxx, SiGe Eclips Lite.

Really fast and really expensive is Gigacomm, which is actually CML.
The NB7V52M flop is only about $13 in quantity.