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Using a -ve supply to create 20 dBm the amplifier needs to deliver a peak voltage swing of 3.16 V and a peak current of 63.2 mA into the 50-ohm load.

-  Design for Id = 70 mA

- to maximize fT use the minimum channel length, L = 180nm

- choose a Vt= 2x Vdsat = 0.4V and Vgs-Vt = 0.2V

- thus I estimate  W=46 μm should give us the desired current.

 - gm = 17.6 mS, Cgs = 47.5 fF,

Use multi-finger gate paths to lower RC using 2.5 μm fingers use 20 fingers, giving W=50 μm and Id = 76 mA min using Vdd = 5V. You may choose a lower Vdd.

- ensure you have thermal vias below chip and wide traces to conduct heat away.

What do you get?