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When the MOSFET is used as a switch, it it operated at the extreme points of the transfer curve. Specifically, the device is turned off by keeping Vi<Vt resulting in operation with ( Vo = Vdd, Vo = 0 ). The switch is turned on by applying a voltage close to Vdd, resulting in operation with ( Vo = 0, Vo = Vdd ). At this juncture, the common-source MOS circuit can be used as a logic inverter with the '( low, high )' voltage level close to 0V and the '( high, low )' level close to Vdd.
