From: bon@hertz.ikp.physik.tu-darmstadt.de   
      
   john larkin  wrote:   
   ...   
   > That's about 12 power supplies!   
   >   
   > My new gadget, the PPG (Precision Pulse Generator) only needs about 7.   
   >   
   > Interestingly, the most critical one, for noise and drift, is the 1.2   
   > volt FPGA core supply. 100uV changes the prop delay more than I like.   
   >   
   >   
   Consider some stabilization loop. Some FPGA TDC design use similar   
   approaches.   
      
   --   
   Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de   
      
   Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt   
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