defined as the gate voltage at which a selected value of current I_D0 occurs, for example, I_D0 = 1uA, which may not be the same V_th-value used in the equations for the following modes.

Some micropower analog circuits are designed to take advantage of subthreshold conduction. By working in the weak-inversion region, the MOSFETs in these circuits deliver the highest possible transconductance-to-current ratio, namely: , almost that of a bipolar transistor.

The subthreshold I-V curve

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