From: mcmurtrie@pixelmemory.us   
      
   In article <81hbl4FppnU1@mid.individual.net>,   
    "Richard Crowley"  wrote:   
      
   > "Randy Yates" wrote ...   
   > > Kevin McMurtrie writes:   
   > >> The output of that follower also drives a shield on the input wire.   
   > >   
   > > "that" follower? Which one? Are you talking about shielded, twisted   
   > > pair cable?   
   > >   
   > >> The result is a virtually perfect cable with no capacitance and no   
   > >> insulation losses.  (It only works as long as the electrical   
   > >> wavelength of the input is much longer than the wire, as with audio.)   
   > >   
   > > Without the previous clarifications, it's hard for me to grok this   
   > > last statement, but it sounds like an interesting result.   
   >   
   > He appears to be talking about the technique of using a "driven guard"   
   > http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=00706021   
   > I hold a patent for using that technique to probe very low currents   
   > on semiconductor wafers.   
      
   I figured out where my copy of "The Art of Electronics" was hiding.   
   "Driven guard" or "bootstrapped guard" is it.   
      
   It's funny that a patent can be granted for the application of that to   
   silicon wafers sensors.   
   --   
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