Differential Amplifier

Discussion in 'General Electronics Chat' started by farman99, Apr 5, 2016.

  1. farman99

    Thread Starter New Member

    Apr 5, 2016
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    if there are two single inputs to a difference amplifier are Va and Vb. And these inputs are simple function of cos or sin with different frequency and phase. then the difference of these is very simple by Vo=Vb-Va.
    However, what if the two inputs of the diff amplifier are infact the outputs of two different mixers (each mixer output has sum and difference components). Can a single amplifier on its own gives single output based on the given inputs? OR multiple difference amplifier is needed to integrate?
    Also please state that in terms of size, whether the size on chip will be greater?
    Any alternative to this type of operation if someone can provide, please state. Thanks
     
  2. hp1729

    Well-Known Member

    Nov 23, 2015
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    Yes, it will be a single output, maybe not what you expect. My suggestion is to build it and see if it does what you want.
     
  3. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    The complexity of the input has no influence on the amplifier needed. Your question is like asking, can I use the same amplifier for rock music and classical music.

    The only issue would be slew rate. If some of the complex signals have very fast rising or falling edges, then that is more of a question of picking the right components for your signal - adding more stages usually hurts speed rather than helps.
     
  4. farman99

    Thread Starter New Member

    Apr 5, 2016
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    Thanks for your suggestions but let me elaborate my question by looking at the attached model, can a single differential amplifier perform the complex inputs as show in the attachment?


    --Sorry the file cannot be uploaded
     
  5. Willen

    Member

    Nov 13, 2015
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    'Zip' your model and try to upload again.
     
  6. dannyf

    Well-Known Member

    Sep 13, 2015
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    Yes. The amplifier doesn't know nor does it care, where the signal comes from.
     
  7. hp1729

    Well-Known Member

    Nov 23, 2015
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    You can spend a week here asking questions or an hour or so building it to find out.
     
  8. farman99

    Thread Starter New Member

    Apr 5, 2016
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    ok, thank you all, i got my answer.
     
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