High speed pulse generator to test oscilloscope

On Monday, May 12, 2014 3:39:03 AM UTC-7, haitic...@gmail.com wrote:

> I have a Tek TDS694C I will be selling, and I'd like to demo it's high speed  
> performance by showing it detecting a rise time...

> Is there a chip which will show a fast rise time? I believe they use some kind of  
> high speed fpga? 

FPGA's are slugs.  You'd do better with a discrete solution,
or even a mercury-wetted pulser (and with a length of good
coax cable, that makes a nice Blumlein pulse generator).

<http://en.wikipedia.org/wiki/Pulse_forming_network>

On Mon, 12 May 2014 15:10:07 -0400 Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote in Message id:
<55mdnb33iLUSgezOnZ2dnUVZ_sednZ2d@supernews.com>:

>It's my favourite general-purpose high speed scope.  I have a couple of 
>500-MHz ones, which are about the fastest that still have the 1 Mohm 
>input option, but for anything I can use 50-ohms for, or can hang a FET 
>probe on, the 694C is the proverbial bee's knees.  125 ps rise time, no 
>overshoot, whee!
>
>Mine has the 2Msample memory as well, which is a win, and a nice bright 
>display.

2M was not available in the TDS600 series. The maximum memory was 120K per
channel for the TDS694C (option 1M) The TDS694X was the only one that had
any memory options.

What's interesting is that the TDS684C acquisition board is laid out for
larger memory chips - I've always wondered what would happen if I were to
populate them...

On Monday, May 12, 2014 5:02:35 PM UTC-4, Lasse Langwadt Christensen wrote:
> Den mandag den 12. maj 2014 15.06.00 UTC+2 skrev George Herold:

> > There's a nice J. Williams article about fast edges/ pulses
> > AN47?  (maybe?)
> 
> 
> http://cds.linear.com/docs/en/application-note/an47fa.pdf
> http://cds.linear.com/docs/en/application-note/an72f.pdf
> 
Thanks Lasse, I was thinking of this one where he (J.W.) does a pulser from 
a mercury reed relay near the end... maybe the diode turn on/ off time app note.  
here,
http://cds.linear.com/docs/en/application-note/an122f.pdf
AN94 (taming of the slew) is nice too.  

George h.
> 
> -Lasse
> 
> 
> 
> 
> 
> -Lasse