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Types of MOSFETs ECE 2204.

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Presentation on theme: "Types of MOSFETs ECE 2204."— Presentation transcript:

1 Types of MOSFETs ECE 2204

2 Types of MOSFETS n-channel Enhancement Mode (nMOSFET) p-channel
(pMOSFET) Depletion Mode

3 MOSFETs Also known as Normally Off transistors.
Enhancement mode Depletion mode Also known as Normally Off transistors. A voltage must be applied to the gate of the transistor, at least equal to the threshold voltage, to create a conduction path between the source and the drain of the transistor before current can flow between the source and drain. Also known as Normally On transistors. A voltage must be applied to the gate of the transistor, at least equal to the threshold voltage, to destroy a conduction path between the source and the drain of the transistor to prevent current from flowing between the source and drain.

4 Cross-Sectional View of n channel Enhancement Mode Transistor
oxide

5 Before electron inversion layer is formed
After electron inversion layer is formed

6 p channel Enhancement Mode Transistor

7 n channel Depletion Mode Transistor

8 p channel Depletion Mode Transistor

9 Symbols for n channel Enhancement Mode MOSFET
VGS ≥ 0V, VDS ≥ 0V VTN is positive

10 Symbols for p channel Enhancement Mode MOSFET
VGS ≤ 0V, VDS ≤ 0V VTP is negative

11 Symbols for n channel Depletion Mode MOSFET

12 Symbols for p channel Depletion Mode MOSFET

13 PSpice MOSFET Symbols The IRF150 is an nMOS and the IRF9140 is a pMOS. Both are enhancement mode transistors. The body terminal is connected to the source terminal on the FET. “M” is used to denote that the device is a MOSFET.

14 Family of iD Versus vDS Curves: Enhancement-Mode nMOSFET
Triode/ Nonsaturation VDS ≤ VGS – VTN VDS ≥ VGS – VTN Pinch-off/Saturation Enhancement Mode FETs are also known as Normally Off devices. Voltage must be applied to the Gate to allow current to flow between the Source and the Drain.

15 Family of iD Versus vDS Curves: Depletion-Mode nMOSFET
Depletion Mode FETs are also known as Normally On devices. Voltage must be applied to the Gate to stop current from flowing between the Source and the Drain. Assuming that VTN < -1V

16 For this course I am going to emphasize the operation and applications of Enhancement Mode FETs

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