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Why gm-C channel selection filter in RF transceiver?

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fxxjssc

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why gm-c filters

Hi all,
Why gm-C, mosfet-C and some other continuous filter in RF transceiver?
I think switched-capacitor filters are with higher performance than continuous
filter.
Would you like give me some comments about this issue or is my understanding
not right?
Best wishes
Fxxjssc
 

Sure switched cap filter can achieve much better accuracy but they can work at lower speeds than the speeds which Gm-C filter can reach . Further more Gm-C filters are more simple and can be easily used to used to build up complex filters (for Image rejection). Furthermore, the Gm-C filters can be calibrated to get acceptable accuracy in frequency and quality factors. That's why Gm-C filters are widely used.
 

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