From: pchung705@gmail.com   
      
   Current mirror is inevitable part of input stage of operational amplifiers.   
   Current mirror behaves almost as perfect current source in small current   
   signals application and it has excellent characteristic for bipolar transistor   
   biasing.   
      
   Read more:   
   http://www.cirvirlab.com/index.php/electronic/165-current-mirror   
   and-current-source-transistor-biasing.html   
      
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