Active circuit transfer functions in terms of variables?

I am trying to simulate an active circuits in Simulink using bloacks like resistors, caps and voltage and current sources. I just dont want to plug in values for circuit elements, rather, i just want them in terms of variables like R1, R2, C1, C2, etc.Now, I want to simulate this circuit to give me a transfer function in terms of variables only like ( for example):

H(s) = P(s)/Q(s) = (R1*C1*s + 1) / (R2*C2*s^2 + R1*C1*s + 1)

In effect, i want a variable transfer function. Is this possible? I dont want anything like an absolute transfer where i will have to plug in the values of these variable circuit elements (for example):

(2s+1)/(3s^2+5s+8)

Please help. Regards.

Answer 1

[Guy Rouleau]

See my article here on this topic:

http://blogs.mathworks.com/seth/2011/03/08/how-do-i-change-a-block-parameter-based-on-the-output-of-another-block/

and especially this technical solution:

http://www.mathworks.com/support/solutions/en/data/1-D9A379/

[Sharjeel]

Dear Guy,

Your answer doesn't solve my problem. I am sending over a screenshot of the circuit I am trying to simulate to your personal email because I cant find a way of attaching a file here.

Please answer me in reference to that diagram.

Regards,

Sharjeel.