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Op-amp overloaded

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Discussion in 'Datasheets, Manuals and Component Identification' started by luke67, Nov 27, 2012.

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  1. Nov 27, 2012 #1
    luke67

    luke67

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    Mar 18, 2012
    Hi! I am having trouble with a commercial filtering board made with operational amplifiers; here a part of the documentation:
    "Due to the low cut-off frequency, the baseline restorer takes some time to stabilize after switching on the amplifier or after replacing the MEA. One to two minutes are quite normal. During this time, the filter amplifier input will be overloaded and you will see only a straight line with very low noise. This is considered a normal behaviour and should not trouble you"
    DO you know what does it mean "input overloaded"?
    Thank you
     
  2. Nov 27, 2012 #2
    duke37

    duke37

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    Jan 9, 2011
    An op-amp can only deal with a certain range of input signal, depending on the circuit. If the input exceeds this range then the output will be hard over and no AC signal will come out.

    If the input circuit has a low cut-off frequency, the input bias will take quite a while to stabilise after switch-on. You have effectively put a very high amplitude low frequency signal into the amp. Just have a little patience!
     
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