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Typology: Study notes
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Metal Oxide Semiconductor Field Effect Transistors EBB424E
School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia
Different types of FETs Junction FET (JFET) Metal-Oxide-Semiconductor FET (MOSFET) Metal-Semiconductor FET (MESFET)
Different types of FETs Metal-Oxide-Semiconductor FET (MOSFET)
Different types of FETs Metal-Semiconductor FET (MESFET)
Basic MOSFET (n- channel) Increasing the +ve gate voltage pushes the p- type holes further away and enlarges the thickness of the created channel. As a result increases the amount of current which can go from source to drain — this is why this kind of transistor is called an enhancement mode device.
Cross-section and circuit symbol of an n-type MOSFET.
Basic MOSFET (p- channel) These behave in a similar way, but they pass current when a -ve gate voltage creates an effective p-type channel layer under the insulator. By swapping around p-type for n-type we can make pairs of transistors whose behaviour is similar except that all the signs of the voltages and currents are reversed. Pairs of devices like this care called complimentary pairs.
(^) Note that with a n-channel device we apply a +ve gate voltage to allow source-drain current, with a p-channel device we apply a -ve gate voltage. Illustrates the behaviour of a typical complimentary pair of power MOSFETs made by Hitachi for use in hi-fi amplifiers.
Structure and principle of operation A top view of MOSFET, where the gate length, L , and gate width, W. (^) Note that L does not equal the physical dimension of the gate, but rather the distance between the source and drain regions underneath the gate. (^) The overlap between the gate and the source/drain region is required to ensure that the inversion layer forms a continuous conducting path between the source and drain region. (^) Typically this overlap is made as small as possible in order to minimize its parasitic capacitance. (^) Top view of an n-type MOSFET
I-V Characteristics of MOSFET
I-V Characteristics of MOSFET
Ideal Output Characteristics of MOSFET
Ideal Transfer Characteristics of MOSFET