Polyphase filter simulation

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aibrahim

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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,
 

aibrahim said:
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,
Click to expand...

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).
 

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,
 

Good paper about polyphase filter

**broken link removed**

I think it nice one,

Refgards,
 

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