RF IC layout inverter signal routing

Hi all,

I am doing the layout for a RF cmos inverter chain.
As the inverter gets bigger, the distance between the leftest and rightest finger becomes quite large. around 30um.
the circuit operates at around 1.6GHz.

Can I connect all the fingers together and route the input signal at the middle point ?
or I should consider the different arrival time of the input signal at different finger and adopt a tree structure ?

Thank you.
whlinfei