From: dk4xp@arcor.de   
      
   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   
      
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