[help]design a 5 order LPF

[kairimai]

lpf ansoft designer

simulation with filter solution,ADS,ansoft designer,awr mwo

but only the results of ansoft designer and awr mwo is same
the result of filter solution is ten times than the ansoft designer
the result of ADS is helf of the ansoft designer

why?what's result is correct?!

 

[m.salehi]

lpf design

hi,
I think u have a mistake!
ur results must be same.
however I prefere filter solution due to very theoritical solution.
I prefer MWO due to solutions goes to expriment.
bye.

 

[flatulent]

What technology and frequency range are you using? There are some subtle things like the program wanting either cyclic or radian frequency inputs.

 

[m.salehi]

hi
I advise u to see ARL Handbook.
it is soo good reference to design a filter manually.
bye.

 

[kairimai]

here is the file ,included the sch and result,see its pls

 

[kairimai]

5 order hourglass LPF for 17MHz pass band freqency application, see the attachement.

hi m.salehi,
Can you tell me the full name of the " ALT handbook"?

3Q everybody

Added after 9 minutes:

hi m.salehi,
Can you tell me why the "source res" and "load res" are affect the resule badly,and how to set its.

Only the "source res" and "load res" ,I don't know how to set. I think the 50ohms is more popularly

3Q

 

[flatulent]

Notice that the Filter Solution frequency units are radians/second.

 

[kairimai]

hi flatulent,
you are right, charge the unit to hz ,the result form ansoft is correct.

3Q

 

[jiangnancai]

It is a passive filter...haha

simulation with filter solution,ADS,ansoft designer,awr mwo

but only the results of ansoft designer and awr mwo is same
the result of filter solution is ten times than the ansoft designer
the result of ADS is helf of the ansoft designer

why?what's result is correct?!