Ideal op amp (current to voltage converter + inverting)

Discussion in 'Homework Help' started by naspek, Mar 20, 2010.

  1. naspek

    Thread Starter Member

    Feb 17, 2010
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    Hey there.. need helps here..
    The question is..
    Derive an expression relating the output voltage, Vo to the input current, Iin.

    i try to derive it.. but..
    got problem with RL
    V1 = -IinRf
    Vo =- R2/R1(-IinRf) how to include Rl in my derivation?

    [​IMG]
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Voltage gain don't depends on the load resistance
     
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  3. naspek

    Thread Starter Member

    Feb 17, 2010
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    should i ignore the RL?
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
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    RL should be high enough in value to not overload the drive capability of the amplifier.
     
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  5. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Yes, because you dealing with ideal opamp.
     
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  6. hgmjr

    Moderator

    Jan 28, 2005
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    To reinforce the statement already provided by others, the load resistance normally does not have an effect on the gain. Particularly when you are dealing with an ideal opamp.

    hgmjr
     
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  7. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    An ideal op amp has zero output impedance.
     
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