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???
01/24/08 12:24
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 		 #149906 - Use input bias current
Responding to: ???'s previous message
I find the input impedance of an opamp is meaningless, as most errors are caused by the input bias current. This is 25nA typ for the OP37, but may rise to 150nA at maximum temperature. The OP37 has some bias current matching, so balanced source impedances will reduce offset errors slightly.


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List of 26 messages in thread
TopicAuthorDate
Opamp datasheet Question            01/01/70 00:00      
   page 3            01/01/70 00:00      
      TLC 271            01/01/70 00:00      
   Use input bias current            01/01/70 00:00      
      Use input bias current            01/01/70 00:00      
         ?what application            01/01/70 00:00      
         More info?            01/01/70 00:00      
         so, you have left the "low cost" area            01/01/70 00:00      
         opa129            01/01/70 00:00      
         I find it always a bit funny...            01/01/70 00:00      
            It's like those high-res PC sound cards ...            01/01/70 00:00      
            More details + missing detail from datasheet            01/01/70 00:00      
               Frequency control in oscillator            01/01/70 00:00      
                  relaxation oscillator            01/01/70 00:00      
                     Ssshh..            01/01/70 00:00      
                        Ssshh..            01/01/70 00:00      
                           Ap you are at it again - not a flame            01/01/70 00:00      
                              progressive evolution            01/01/70 00:00      
               have you had a look at            01/01/70 00:00      
                  sensirion.com            01/01/70 00:00      
               Link and answer            01/01/70 00:00      
                  www.hygrosens.de            01/01/70 00:00      
                     It's a double CMOS555, e.g.TLC556            01/01/70 00:00      
   Another sensor and schematic using 555            01/01/70 00:00      
      Another sensor and schematic using 555            01/01/70 00:00      
         Price            01/01/70 00:00      

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