How Do You Find the Phase Equation of a Lossy Low Pass Filter?

jonni
Messages
2
Reaction score
0

Homework Statement


I'm a bit confused about how to find the phase equation of a lossy low pass filter
eg.
r6yf51.jpg


Homework Equations


For a normal low pass filter it's just arctan(wRC)



The Attempt at a Solution



jja1is.jpg


So I am comparing this by subbing in values and comparing to a bode plot of an actual circuit on a breadboard and a spice version of the circuit. But this is nothing like what i get in spice, I've checked for errors but I think its something wrong with the way I am actually calaculating it... but can't figure out why?
 
Physics news on Phys.org
You multplied by the negative of the conjugate. This will screw up your phase equation.
 
Oh thanks so much! Worked out fine now. I feel so stupid haha, i soooo wasn't thinking when i did that! I get the exact same thing except in the last line it's +1 not -1. Makes a big difference though.
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

Engineering Is it possible for a low pass filter to have such a transfer function?
Replies
16
Views
2K
B RC Low Pass Circuit Sine Wave Response
Replies
7
Views
3K
Cascaded low-pass filter followed by a buffer amplifier
Replies
11
Views
4K
Combining High and Low Pass Filters
Replies
2
Views
2K
Engineering How do I draw the Bode diagram of this transfer function?
Replies
3
Views
2K
Engineering Understanding the Gain and Bode Plot of a Low Pass Filter Circuit with C1 > C2
Replies
4
Views
2K
How to graph amplitude vs. frequency for a Low-Pass Filter?
Replies
3
Views
2K
What is the design and performance comparison of third order high pass filters?
Replies
13
Views
5K
Third Order High Pass Filter (Report)
Replies
43
Views
6K
Engineering How to tell if the circuit is a High or low pass filter?
Replies
9
Views
35K

Hot Threads

Recent Insights

Back
Top