From: pchung705@gmail.com   
      
   Combination of one fast op-amp with large slew rate and large voltage offset   
   with one op-amp with small slew rate and small voltage offset and low pass   
   filter can be used for amplification input AC signal on high frequencies   
   without problem that    
   amplifier can be saturated due to voltage offset presence.   
      
   Read more:   
      
   http://www.cirvirlab.com/index.php/electronic/166-op-amp-current   
   offset-op-amp-voltage-offset-and-op-amp-slew-rate.html   
      
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