1 LINLITHGOW ACADEMY PHYSICS DEPARTMENT MOSFETs 2 MOSFETS: CONTENT STATEMENTS Describe the structure of an n-channel enhancement MOSFET using the terms:

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Presentation transcript:

1 LINLITHGOW ACADEMY PHYSICS DEPARTMENT MOSFETs

2 MOSFETS: CONTENT STATEMENTS Describe the structure of an n-channel enhancement MOSFET using the terms: gate, source, drain, substrate, channel, implant and oxide layer. Explain the electrical ON and OFF states of an n-channel enhancement MOSFET. State that an n-channel enhancement MOSFET can be used as an amplifier.

3 FIELD EFFECT TRANSISTOR P-type silicon nn Substrate Metal contacts Insulating Oxide

4 FIELD EFFECT TRANSISTOR P-type silicon nn Substrate Metal contacts Insulating Oxide

5 FIELD EFFECT TRANSISTOR P-type substrate nn SourceGate Drain

6 Circuit Symbol for MOSFET Source Gate Drain

7 How MOSFETS Work Source Gate Drain Drain more positive than source

8 Switching the MOSFET on P-type substrate nn Source GateDrain + _ Source Gate Drain _ No current between the source and drain due to reverse biased junctions formed by the source and substrate.

9 FIELD EFFECT TRANSISTOR P-type substrate nn SourceGate Drain _ _ _ _ _ + N-channel formed by electrons

10 How MOSFETS Work Source Gate Drain V GS V DS Electron flow _ +

11 The Transistor Switch V GS V DS Electron flow _ + Load V GS greater than the threshold voltage (about 2 V) turns on transistor

12 The Transistor Amplifier V in V DS _ + Load Voltage Amplification = V out / V in R2R2 R1R1 V out 0 V