Closed-loop gain of the opamp

Discussion in 'General Electronics Chat' started by penny07, Feb 25, 2014.

  1. penny07

    Thread Starter New Member

    May 25, 2013
    19
    0
    Hi,anyone know that how to find closed-loop gain(Vout/Vin) for this op amp?Thanks:)

    [​IMG]
     
  2. LvW

    Active Member

    Jun 13, 2013
    674
    100
    Since I am too lazy for hand calculation, I have used a symbolic analyzer:

    H(s)=N(s)/D(s) with

    N(s)= R2*Z(s) + R1*Z(s) + R1*R2 + R*R1)
    and
    D(s)=R2*Z(s) + R1*Z(s) + R1*R2 + R*R2)

    Note: Two resistors assumed to be equal (accorcing to the drawing). R1 and R2 are the pot resistances (left, right) with R1+R2=Rp.
     
  3. penny07

    Thread Starter New Member

    May 25, 2013
    19
    0
    Thanks.If I desire to get maximum gain 15db and minimum gain -15db, how can I calculate the values of R,R1,R2 and Rp? Can I set the value of R and Rp by myself?
     
  4. LvW

    Active Member

    Jun 13, 2013
    674
    100
    What about Z(s)? Really frequency-dependent?
     
  5. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    LvW likes this.
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