# Help needed with transfer function for two stage rc ladder network!

#### AaronR84

Joined Sep 14, 2013
13
Hello to all, I am working on a lab experiment and find myself beating my head up against a wall trying to find the transfer function for cct D in the attached image. With R = 1kohm and C = 0.1uF (Both R's and C's) the magnitude of the transfer function should be 1/3 at a frequency of 10000 rad/s. I know this to be true from my multisim simulation. Every method I have used to calculate the transfer function has been incorrect so far, I even asked the TA from lab for the transfer function, and the her's was also incorrect. Can someone please help me out?

Thanks so much in advance, Aaron.

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#### LvW

Joined Jun 13, 2013
1,127
Aaron - you have mentioned circuit D only.
Therefore, I assume you have solved circuit C.
I am sure you have realized that C and D have the same structure - so what is the problem with D ?

#### AaronR84

Joined Sep 14, 2013
13
I am going about obtaining the transfer function the same way for cct c and d, by performing kcl @ Vo and @ the node between Vo and Vi, but I keep going wrong somewhere on D. I will try recalculating cct D while looking more closely at what I did on cct C and post my calculations up if I don't get any further. Thanks for the help!

#### AaronR84

Joined Sep 14, 2013
13
Eureka! I looked over how I got H(s) for cct C and then cct D came out correct, THANKS!

#### LvW

Joined Jun 13, 2013
1,127
Eureka! I looked over how I got H(s) for cct C and then cct D came out correct, THANKS!
My gratulation!