Re: Fast sampler

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:

[...]

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.
>
Cheers
>
Phil Hobbs

>
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.

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 :-)
--
Gruesse, Joerg
http://www.analogconsultants.com/