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What is the main role of the polyphase filters in RF transceivers?

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drabos

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What is the main role of the polyphase filters in RF transceivers?
 

Re: poly phase filters

To generate I and Q signal
 

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    drabos

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poly phase filters

they are used extensively IQ modulators and demodulators , to genarte I and Q signals from the LO

khouly
 

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    drabos

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poly phase filters

1. Splite the RF signal to 0deg and 90deg for IQ or image rejection usage.
2. Notch filter for image rejection.
 

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    drabos

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poly phase filters

and what are the other possibilities to generate I and Q signals? What is the advantage of polyphase filters?

What is the advantage of Legendre polynomial filters?

Thanks
 

poly phase filters

other posiblities , it use some sort of frequqcy dividers , so if the LO is 2 or 4 times , no need for the poly phase filter

but if ur LO is the same freq , u need a poly phase filter

khouly
 

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    drabos

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poly phase filters

Hi Khouly

Can you recommend me a good literature in this topic?
 

Re: poly phase filters

Hello,

They are mainly used as channel filter in combination with quadrature mixer to filter the image signal in Receiver and generate I and Q signal.

Hereafter you can find some references on this issue:

"CMOS mixers and polyphase filters for large image rejection" from Behbahani, F.; Kishigami, Y.; Leete, J.; Abidi, A.A.

**broken link removed**
 

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    drabos

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Re: poly phase filters

drabos said:
What is the main role of the polyphase filters in RF transceivers?
Click to expand...

I think it is image frequency rejection.
 

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