AdvancedA-002-004-001
What is an enhancement-mode FET?
C
Answer
Circuit design and power supplies
Type
A
An FET without a channel to hinder current through the gate
B
An FET with a channel that allows current when the gate voltage is zero
C
An FET without a channel no current occurs with zero gate voltage
D
An FET with a channel that blocks voltage through the gate
Answer Notes
An enhancement-mode Field Effect Transistor (FET) is designed so that no conductive channel exists between the source and drain when the gate-to-source voltage is zero. Because of this, it is known as a "normally off" device.
To allow current to flow, a gate voltage must be applied to "enhance" or create the channel by attracting charge carriers into the region. This requirement to actively build the channel gives the device its enhancement-mode name.
The incorrect options describe depletion-mode FETs (which are normally on and have an existing channel at zero gate voltage) or contain nonsensical descriptions about blocking voltage through the gate.
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What is a depletion-mode FET?