Input Dynamic range of Op-Amp circuits

Discussion in 'Homework Help' started by testing12, Sep 30, 2011.

  1. testing12

    Thread Starter Member

    Jan 30, 2011
    80
    2
    Hello Everyone,

    Im looking for some help with calculating the input dynamic range of the op-Amp circuit below. Can someone please direct me?

    [​IMG]


    I know that if V1(t) falls outside the input dynamic range, the circuit saturates, ie goes to either +/- 13 volts..Just not sure how to find the range.

    Thank you.
     
  2. testing12

    Thread Starter Member

    Jan 30, 2011
    80
    2
    Here is ym attempt: for a summing amplifier:

    V(out)= - (Rf/R1)*v1 -(Rf/R2)*v2

    13 = -(33/10) *(v1) - (33/100) *(2)

    v1= +/- 4.14 volts
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    You effectively have an inverting / summing amplifier.

    Vo(t)=-(K1*Vb(t) + K2*Va(t))

    K1 & K2 an be deduced from the resistor values
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    Looks like you have the idea.
     
  5. testing12

    Thread Starter Member

    Jan 30, 2011
    80
    2
    Thank you sir!!
    I wasnt to sure about how the capacitor will affect all this. :)
     
  6. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    At this point the question is only concerned with the voltage Va(t) and not the source 'Sync-out' . If the level at 'Sync-out' was quoted rather than Va(t) then one would have to consider a more complex analysis. What you have done is correct.
     
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