Active-RC Filter with 100MHz cutoff and 70dB SFDR in 0.35um?

[frozenduck]

active rc filter

Is it possible to design the filter with cutoff frequency = 100 MHz and the SFDR > 70 DB with 70 MHz Input? The process is 0.35um CMOS.

Is it possible to implement it in active RC?

In active RC, the opamp should have enough loop-gain at 100MHz to ensure the linearuity, right? If I use two stage opamp with 20dB/dec decrease, the GBW will be extreme high. If I use multi-stage opamp, the stability will be an issue. Is there any way to solve the problem?

Or I need to use openloop Gm-C filter? Which one is better for the specs?

Thanks.

 

[jiangnancai]

0.35um cmos op-amp for filters

100MHz? may be too large for active-rc topology