5/ 29/13 MOS Transistor Definiti ons w w w.ece.unm.edu/~j i mp/ v l si/sli des/ chap2 1. html 1/16 MOS T ransistor Definitions n-type MOS: Majority carriers are electrons. p-type MOS: Majori ty c arr ier s are hol es. Positi ve/ negati ve v oltage applie d to t he gate (with re spectto substrate ) enhances the nu mber of electr ons/holes in the channel and increases conductivity between source anddrain. Vt def ines the voltage at w hich a MOS transistor begins to conduct. For v oltages less than Vt (threshold voltage), the chan nel is cut off . MOS T ransistor Definitions In normal ope rat ion, a positi ve v oltage applie d between source and drai n (Vds ). No cur re nt f lows betw een sour ce and dr ain (Ids = 0) with Vg s = 0 because of back t o back pn junctions.
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