
#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

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PF Gold
P: 11,006

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



#3
Feb1313, 09:21 AM

P: 27

yes.




#4
Feb1413, 06:10 PM

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PF Gold
P: 11,006

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

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PF Gold
P: 2,020





#7
Feb1413, 07:06 PM

P: 15

Im sorry its sine not cosine.




#8
Feb1513, 01:18 PM

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PF Gold
P: 2,020

[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] 


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