- #1

roam

- 1,271

- 12

## Homework Statement

I'm trying to make a theoretical Bode Amplitude plot of the following circuit in Matlab:

The transfer functions is given by

##T=\frac{V_{out}}{V_{in}}=\frac{R_2}{R_2+z_p}##

##z_p=R_p|| j \omega L || \frac{1}{j \omega C} = \frac{R_p}{1+ j R_p (\omega C - \frac{1}{\omega L})}##

Where ##R_p## is the parallel loss resistance of the inductor (~19.49 Ω). R

_{2}=300, C=22.09 nF, L=10.08 mH.

I know that the graph is supposed to look like a notch (trap) filter, here is an experimental graph of this same filter:

## The Attempt at a Solution

Here is the code I used to make a theoretical plot:

R=1440.96;

C=22.09e-9;

Rp=19.49;

R2=300;

L=10.08e-3;

s = tf('s');

z=Rp/(1+(Rp*C)+(Rp/(s*L)));

sys = R2/(R2+z);

h = bodeplot(sys);

setoptions(h,'FreqUnits','Hz','PhaseVisible','off');

grid;

But my plot looks like this:

And after the 10

^{3}point it's completely flat.

What is wrong with my code?

Any help is appreciated.