All FPGA: What is the recommended Bypass Capacitor size for DDR3 Power filter? Can I use a small capacitor due to my board's limited space?
The recommended Bypass capacitor size is 0603.
Yes, 0.1uF capacitors can be smaller than 0603, it is also recommended to use of 0402 or 0201 size capacitors.
Using smaller capacitors can improve performance when its mounting bias are in pads or off to side.