For a particular IC-fabrication process, the transconductance parameter k'n = 50 µA/V2, and Vt = 1 V. In an application in which vGS = vDS =Vsupply = 7 V, a drain current of 0.8 mA is required of a device of minimum length of 2 µm. What value of channel width in (µm)(unit) must the design use?