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CMOS high frequency gm-c filter???

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ezbentley

ezbentley

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1ghz gm-c filter

My boss wants me to design a tunable gm-c filter from tens of MHz up to 1GHz in 0.18um CMOS. Is this possible at all? I have been scanning through papers and the highest frequency gm-c filter I found was 350MHz.

There are different structures to build transconductors. Does anyone have any idea which topology has the best frequency capability?

If gm-c cannot work at 1GHz, is there any other active filter topology that can be tuned from tens of MHz to 1GHz?

Thanks in advance.
 

high-linearity gm

I think that it is possilbe to design gm-c filter at 1GHz. The simplest gm is the differential pair which can work at the highest frequency. but its linearity is poor. It is not very difficult to design a filter with high freqency. It will be a big problem if high linearity is also needed at the same time
 

    ezbentley

    ezbentley

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I guess linearity is not a main concern. The main issues are high frequency capability and wide tuning range.
Can anyone recommend a high tuning range topology? From say 10MHz to 1GHz?
 

What would be the bandwidth?

same for 10MHz and 1GHz?
 

There is no hard limit on the bandwidth, but it should be between 10MHz ~ 100MHz.
Thanks for helping.
 

I think ur boss is crazy.
 

    ezbentley

    ezbentley

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