FETs are further divided into depletion-mode and enhancement-mode types, depending on whether the channel is turned on or off with zero gate-to-source voltage. For enhancement mode, the channel is off at zero bias, and a gate potential can "enhance" the conduction. For the depletion mode, the channel is on at zero bias, and a gate potential (of the opposite polarity) can "deplete" the channel, reducing conduction. For either mode, a more positive gate voltage corresponds to a higher current for n-channel devices and a lower current for p-channel devices. Nearly all JFETs are depletion-mode because the diode junctions would forward bias and conduct if they were enhancement-mode devices; most IGFETs are enhancement-mode types.
FETs are further divided into depletion - mode and enhancement - mode types , depending on whether the channel is turned on or off with zero gate - to - source voltage . For enhancement mode , the channel is off at zero bias , and a gate potential can " enhance " the conduction . For the depletion mode , the channel is on at zero bias , and a gate potential ( of the opposite polarity ) can " deplete " the channel , reducing conduction . For either mode , a more positive gate voltage corresponds to a higher current for n - channel devices and a lower current for p - channel devices . Nearly all JFETs are depletion - mode because the diode junctions would forward bias and conduct if they were enhancement - mode devices ; most IGFETs are enhancement - mode types .
At what point is a channel off in enhancement-mode?
At what point is a channel off in enhancement - mode ?
at zero bias
at zero bias