Register to reply 
What's negative frequency in analysis of s domain and w domain 
Share this thread: 
#1
Feb1313, 08:34 AM

P: 27

what's negative frequency???
can we say s=3 in example bode plot !!!!! or we can say it's unstable at w=3 rad/s that's I mean is there negative frequency???????????? 


#2
Feb1313, 08:47 AM

Homework
Sci Advisor
HW Helper
Thanks
P: 12,794

Where have you seen a negative frequency occur?
Something like this? 


#3
Feb1313, 09:21 AM

P: 27

yes.



#4
Feb1413, 06:10 PM

Homework
Sci Advisor
HW Helper
Thanks
P: 12,794

What's negative frequency in analysis of s domain and w domain
The link explains them.



#5
Feb1413, 06:52 PM

P: 15

Negative frequency is nothing but phase reversal.
eg. sin(2pi(f)t)=sin(2pi(f)t) 


#6
Feb1413, 07:04 PM

Sci Advisor
PF Gold
P: 2,080




#7
Feb1413, 07:06 PM

P: 15

Im sorry its sine not cosine.



#8
Feb1513, 01:18 PM

Sci Advisor
PF Gold
P: 2,080

[tex]V(t)=\Re\{[\cos(\omega t)+j\sin(\omega t)]\exp(j\omega_0 t)\}[/tex]versus [tex]V(t)=\Re\{\cos(\omega t)j\sin(\omega t)]\exp(j\omega_0 t)\}[/tex] 


Register to reply 
Related Discussions  
Advantage of frequency domain analysis?  Electrical Engineering  12  
Frequency domain vs time domain solution of PDEs  Differential Equations  0  
(signal processing)Time domain vs Frequency domain, totally confused!  Electrical Engineering  8  
Fatigue analysis:frequency domain vs time domain  Mechanical Engineering  11  
Time Domain Functions to Frequency Domain  Engineering, Comp Sci, & Technology Homework  4 