P-n-p

2 definitions found

From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:

  PNP
       Plug 'N Play (PNP), "PnP"
       
       

From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:



  PNP
       
          1.  A type of {bipolar transistor} consisting of
          a layer of N-doped {semiconductor} (the "base") between two
          P-doped layers (the "collector" and "emitter").  PNP
          transistors are commonly operated with the emitter at {ground}
          and the collector at a negative {voltage}.
       
          In the 1960s, the germanium PNP transistor was the cheapest
          and best for use at ordinary temperatures.  The {leakage
          current} from collector to base in this type of device is
          larger than for the silicon transistor, and also varies more
          with temperature.  The effect of these deficiencies can be
          lessened by proper biasing and feedback, which can make the
          circuit both serviceable and reliable.  Neither germanium nor
          PNP transistors are as common today.
       
          The voltages used on a PNP transistor are inverted when
          compared with {vacuum tubes}.  Further, the behaviour of
          vacuum tubes is usually described in terms of {voltages}
          whereas transistors are better described in terms of
          {current}.
       
          2.  {plug and play}.
       
          (1997-05-05)