Replacing resistors with active load in active filter
If you really are doing CMOS analog design and you are using large resistors you're already heading in the wrong direction.  There are all sorts of issues with resistors in CMOS processes like: parasitics (capacitance, non-linear capacitance), Low resistance values and extremely poor matching. NOC design (Non-overlapping clock) is trivial in comparison.  At least you can be sure it will work in Si.  I'd recommend a switched capacitor approach using differential signalling, there are even good topologies in layout that help cancel/balance stray capacitance effects.

Since you already have you floating capacitor (Feedback) you obviously are already using a MIM or PIP capacitor, you've all the modules necessary in your process.