From: dk4xp@arcor.de   
      
   Hi,   
   that post of mine never showed up here in the newsgroup.   
   Nor did a retry. Did you get it as personal mail? In the sent-box   
   it is addressed to s.e.d.   
      
   Weird.   Gerhard   
      
      
   Am 29.11.25 um 16:40 schrieb john larkin:   
   > On Sat, 29 Nov 2025 05:02:33 +0100, Gerhard Hoffmann    
   > wrote:   
   >   
   >> Am 29.11.25 um 04:12 schrieb john larkin:   
   >>   
   >>>   
   >>> We do picosecond-resolution delays with simple RCs and comparators.   
   >>> Works fine.   
   >>>   
   >>> There are some programmable silicon-delay-line chips. They are   
   >>> expensive and basically worthless.   
   >>   
   >> In a previous life I used a dozen or 2 of AD9500 to control the   
   >> phase delays in a phased array to sweep the direction of the   
   >> ultrasonic beam for scanning the inner enclosure of nuclear reactors.   
   >>   
   >> Worked nicely. In the lab, it was set up by a HP-85 desk top   
   >> computer via HP-IB.   
   >>   
   >> 25 years later some SY89??? chips to delay a 1pps at will with   
   >> ps resolution and CML levels. No complaints.   
   >>   
   >> Gerhard   
   >   
   > There was the MC100EP195 and the Micrel equivalent. I played with   
   > those. The MC wasn't monotonic on delay and had a lot of jitter. Both   
   > had bad (and unspecified) tempcos. Expensive too.   
   >   
   > They were switched-tap silicon delay lines.   
   >   
   > They might make sense at really high data rates where ramps wouldn't   
   > work and some temperature drift would be OK.   
   >   
   > The AD9500 is a ramp/comparator design that's at least monotonic. It's   
   > tempco is 7.5 ps/degc typ. It's a  Rochester part now.   
   >   
   >   
   >   
   >   
   > John Larkin   
   > Highland Tech Glen Canyon Design Center   
   > Lunatic Fringe Electronics   
      
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