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pnp

pnp

 

  2  definitions  found 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [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) 
 
 
 
  From  V.E.R.A.  --  Virtual  Entity  of  Relevant  Acronyms  13  March  2001  [vera]: 
 
  PNP 
  Plug  'N  Play  (PNP),  PnP"