Polyphase filter simulation

[aibrahim]

Hello All,

I'm designing a polyphase filter (i have designed multi section to creat many notches ) such that i get it functional over certain band.

Can any one tell me how i can measure its frequency responce.

Advanced thanks,

 

[LvW]

Hello All,
I'm designing a polyphase filter (i have designed multi section to creat many notches ) such that i get it functional over certain band.
Can any one tell me how i can measure its frequency responce.
Advanced thanks,

Since during ac analyses you can have more than one signal source, it is no problem to use two sources with a phase difference of 90 deg. simulating the I and Q channel, respectively. (Observe the performance difference using + or - 90 deg).

 

[aibrahim]

Thanks alot, but the problem not in input really in recognizing output

I do the following expression and i can see the output in a nice way

Out= sqrtabs(outI+sqrt(-1)Outq)

so i can see the output correctely. really the problem in measuring noise i have to define single node for output

for differential architecture we simply add vcvs and measure output, but what i can do for a polyphase filter with cascaded section.

Advanced thanks,

 

[Shehata]

I need some info about polyphase quadrature filter, plz snd me a good link/ref
thanks

 

[aibrahim]

Good paper about polyphase filter

**broken link removed**

I think it nice one,

Refgards,

 

[Shehata]

yea that's wt i wanted
thanks,