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Matlab Transfer Function

  1. Nov 20, 2007 #1
    Hi,

    I'm trying to enter this into matlab:

    G(s) = -1/((C1+C2)s)

    How can I enter this into matlab?

    Thanks!
     
  2. jcsd
  3. Nov 22, 2007 #2
    Tranfer function

    Hi
    If C1 and C2 are constants you can simply use tf() function.

    If they are parameters using ode45 functions and a little code will help.

    Best
     
  4. Nov 25, 2007 #3
    I can't seem to figure out how using the ode45 function will help me.
    I have 4 equations:
    G1 = sym('-1/((C1+C2)*s)')
    G2 = sym('-C2*s')
    G3 = sym('-1/(L2*s)')
    G4 = sym('-1/((C3+C2)*s)')
    G5 = sym('-1/(L4*s)')
    G6 = G2

    % Set up equations
    V1 = ((-V1) + (-I2) + (-V3)*G6 + Vin)*G1
    I2 = ((-V1) + (-V3))*G3
    V3 = ((I2) + (-V1)*G2 + (-Vout))*G4
    Vout = ((-V3) + (Vout))*G5

    V1, I2, V3, Vout and I need to solve for Vout/Vin. How can I do this using Matlab?

    Thanks.
     
  5. Nov 25, 2007 #4
    Think I got it.

    Used the solve function.
     
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