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HOw to design band pass filter?

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zahrein

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Im still new in analog circuit design , i was asked to design a band pass filter Front end transmitter for RFID application at 868 MHz using 0.5 micron CMOS technology.

I would like to receive suggestions , where should i start and what is the main thing i should have considered to design the band pass filter.

Any web sites or tutorial that can explain to me will be more helpfull. I do hope you can help me. I wil appreciate for those who help me.
 

Why would you want to filter at RF-Band? Are you planning to make a preselection filter with CMOS?
Or is it Image-Rejection? Then I would use an image rejection mixer.

You can filter at baseband with continous-time active filter or switched capacitor filter.
 

Give us at least the bandwidth and input/output impedance.
 

if the frequency is lower than 300MHz， you can use max274/275
 

The only technology which can integrate RF filter with CMOS IC now is FBAR, refer to agilent website for information, or scholar.google.com
 

center frequency range:
150kHz for MAX274
300kHz for MAX275
 

For simplicity, you can get some ceramic filter for appropriate freq. or just build a bulum or even some microstrip lines on the PCB.... but that hasn't count on their signal loss.

you may need to add some amplification circuit after that.
 

what does center frequency mean?
 

xun said:
what does center frequency mean?
Click to expand...

Center frequency is usually the frequency you want it to pass.
 

Dear all,

Can everyone give me some hits to design the RFID baseband. Since it return signal level is very low. However, it will destroy the waveform if the signal amplified too larger. Please give a help to me !!!

Thanks a lot
 

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