Why do we calculate pole/zero location by hand ?

[bigpiyo]

Hello!
Why do we calculate pole/zero location by hand
different with use HSPICE simulation results ?
Any other analysis pole/zero tool?

THX

 

[manissri]

Re: pole/zero analysis?

in hspice u can do the pole zero analysis...

 

[eezou]

pole/zero analysis?

Hspice can analysis the location of pole and zero. If you calculate pole/zero location by hand, you can know frequency response

 

[shinnyi]

pole/zero analysis?

hspice pole/zero analysis
-------------------------------

.pz vout vin

 

[qutang]

pole/zero analysis?

I have less in frequency response, so I can't analysis the stability ,how can i do?

 

[mists]

Re: pole/zero analysis?

hspice pole/zero analysis
-------------------------------

.pz vout vin

but the output will give a poze/zero table, some pole and zero are very adjacent, then how to analyse this result, how to distinguish the dominate pole and the second non dominant pole. who can share their experience, thank!

 

[fxxjssc]

pole/zero analysis?

maybe some paper will help

 

[zigbee2005]

pole/zero analysis?

maybe you can read some book on signal and system,and you will understand it well.

 

[asping]

pole/zero analysis?

Suggest you to review the principle of signal processing

 

[elbadry]

Re: pole/zero analysis?

Usually the hand analysis is not used to find the exact location of the zeroes and poles. It is used to find the relative positions of the poles and zeroes to help one in design ( so that you know what factors determine the bandwidth and stability of your circuit )

 

[bigpiyo]

Re: pole/zero analysis?

So! I think you are right.
Thank you!

 

[wanily1983]

pole/zero analysis?

i agree with elbadry, you can just use the hand analysis to find the relative location of the zeroes and poles. then regulate their positions to make the system stable.

 

[nuiscet]

pole/zero analysis?

usually we can find the node with the largest capacitor and impedence to decide which node is the position causing the dominate pole and the second non dominant pole. At the output teminal , there should be the dominate pole or the second non dominant pole. and the node with miller capacitor usually causes the dominate pole. The mirror structure also cause the important pole, I think.