Fully Differential Capacitor layout

differential capacitor

Hi, I am designing a fully differential amplifier with capacitive feedback with a 32:1 capacitor ratio. I need the capacitors in common centroid. In addition each of the two signal paths should be the same.

I have attached a picture of what I think the geometry should be. To get common centroid, I have made the unit caps = 2 x smaller unit caps. In the middle of the matrix, i have cross connected the capacitors, these two capacitors are the 1 capacitors for each path (fully diff path has blue and red paths). the 32 capacitor is implemented for both red and blue paths. Is this the best way to connect the capacitors?

Also, how should I route the capacitor connections? Should I use metal 1 for red and metal 2 for blue, or should I use metal 1 = horizontal connections and metal 2 = vertical connections. I think if i use metal 1 for red and metal 2 for blue, then the routing will occupy less space. But will using different metal layers for routing affect the difference in parasitic capacitance?

Thank you

capacitor layout route

Hi there,

To get the ball rolling, I have drawn an
AB
BA
capacitor structure.
Unfortunately my routing is not common-centroid. Is there any way to make the routing symmetical?

Please provide more feedback on my layout, thank you.