Twin-T Notch Filter: Solve the Circuit with Node Analysis

[anthonuc]

Homework Statement

This is a twin-T notch filter.

[PLAIN]http://l23.sphotos.l3.fbcdn.net/hphotos-l3-snc4/hs1360.snc4/163224_10150132441064992_712009991_8008832_7339032_n.jpg

Homework Equations

R = R
C = 1/sC
L = sL

The Attempt at a Solution

Not sure if my complex impedance equations are correct or even useful.

Anyhow I tried using node analysis after changing to complex impedances to see if I could get some equations to manipulate into vout/vin but it seems to get me nowhere really.

I'm fairly puzzled as far as how to approach this circuit. Any advice would be greatly appreciated.

 

[The Electrician]

Have at look at this:

http://www.crbond.com/papers/ent24.pdf

 

[anthonuc]

don't know if that helps.

Solution:

Yeah so I just changed to complex impedances (C = 1/sC) and used node analysis and with enough algebra I managed to manipulate the correct equation.

You just set vx=0 since it's connected to ground.