From: pchung705@gmail.com   
      
   Generally, if input stage of an operational amplifier is realized as BJT   
   transistor differential amplifier, op-amp has smaller slew rate, smaller   
   voltage offset and better CMRR. If it's realized as JFET transistor based   
   differential amplifier, voltage    
   offset is higher, CMRR is smaller but slew rate is better.    
      
   Read more:   
      
   http://www.cirvirlab.com/index.php/tutorials/167-bjt-transistor-   
   ased-differential-amplifier-and-common-mode-rejection-ratio-cmrr.html   
      
   and also simulate:    
      
   http://www.cirvirlab.com/simulation/Differential_Amplifier_Simul   
   tion_Online.php   
      
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