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JFET vs MOSFET vs MESFET-Difference between JFET MOSFET and MESFET

This page compares JFET vs MOSFET vs MESFET and describes difference between JFET, MOSFET and MESFET. The other useful links to difference between various terms are provided here.

JFET

JFET structure

The figure-1 depicts internal structure of the JFET device. Following are the features of JFET:
• The gate voltage controls the channel conductance by modulating the width of the depletion region at the p-n junction.
• The p-region doping is MUCH higher than in the n-region. The depletion region expands mostly into the n-channel.
• For the p-channel JFET, the n-type layer will be doped higher than the p-channel.

MOSFET

MOSFET structure

The figure-2 depicts internal structure of the MOSFET device. Following are the features of MOSFET:
• Gate control through a MOS barrier
• The device in normally-off and current only flows when the gate bias inverts the channel
• Both p-channel and n-channel MOSFETs are possible giving rise to CMOS
• MOSFETs typically will have cutoff frequencies less than 1 GHz.
• Main Application: Integrated circuits, microwave operation is not yet possible

MESFET

MESFET structure

The figure-3 depicts internal structure of the MESFET device. Following are the features of MESFET:
• Gate control through a Schottky barrier
• The device in normally-on and negative gate-bias is needed to cut the current off (in case of the n-channel MESFET)
• Typically n-channel MESFETs are feasible
• MOSFETs typically will have cutoff frequencies greater than 10 GHz.
• Main Application: Microwave devices, integration not as high as the CMOS devices

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