Analog Electronics Help?

Discussion in 'Homework Help' started by conclusionof, Nov 11, 2008.

  1. conclusionof

    Thread Starter New Member

    Nov 11, 2008
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  2. Firestorm

    Senior Member

    Jan 24, 2005
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    What part do you not understand on this problem. Just break the problem up. This is a inverting op-amp, so use that formula. You can combine V1 and V2 with addition. If you have a more specific question, please don't hesitate to ask.
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Vo=-Vin*(R2/R1)

    if you take R1 as Z1 and R2 as Z2 then

    Z2=R and

    Z1=R+jωL

    thus

    Vo=-(V1+V2)*[R/(R+jωL)]
     
  4. conclusionof

    Thread Starter New Member

    Nov 11, 2008
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    I dont understand how to add V1 and V2 up since one of them in sinus function while other is in cosinus form.

    Also can we use here phasor method ? (Though I know it is not proper to use phasor if the frequencies are not same)
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If the frequencies are different you cant use phasors to add them. Just use trigonometric identities to add them or expand each sin or cos in a series form, take the most important bits and add them.

    What exactly V1 and V2 equal to?
     
  6. Firestorm

    Senior Member

    Jan 24, 2005
    353
    0
    You can convert the cos function to a sine function by adding a \pi/2 to the sine function:

    Ex:
    sin(A) = cos(A+\pi/2)
     
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