Re: Which type of Filters?
No, opamps cannot amplify until 880MHz. At least, not in CMOS. So you are restricted to passive filters (any technology).
But because the bandwidth is very small, and because any CMOS process has large tolerances and low Q, you cannot rely on the process to make great filters. The RF filtering must be done off-chip. This is also why zero-IF or very-low IF receivers are so popular today. No need for expensive off-chip IF SAW/LC filters!
But the first RF filter to select the RFID band, cannot be done in CMOS! It will have to be done in other technologies, eg SAW!