It will be very easy to lay a 50 KOhm resistor and a 100pF cap.
Added after 2 minutes:
Check your design menual to find the right resistor type. For a cap, you can use moscap and on its top use metal finger cap. In 65nm, the metal finger cap density will be big.
Thanks ywang_67 for your reply.
Could you please elaborate the techniques that use moscap and on its top metal finger cap ? I have no idea how it is looks like.