Why gm-C channel selection filter in RF transceiver?

[fxxjssc]

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

 

[Fahmy]

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.