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Chapter 13 MOSFET

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Chapter 13 MOSFET

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    1. 1 Chapter 13 MOSFET Pictures are redrawn (with some modifications) from Introductory Electronic Devices and Circuits By Robert T. Paynter

    2. 2 Objectives Identifies two types of MOSFET and their operations. Describe the threshold voltage, VGS(th). List the biasing circuits applicable to E-MOSFET.

    3. 3 Fig 13.1 n-channel MOSFET.

    4. 4 Fig 13.2 p-channel MOSFET symbols.

    5. 5 Fig 13.3 MOSFET static protection.

    6. 6 Fig 13.4 D-MOSFET operation.

    7. 7 Fig 13.5 Example 13.1. (1) A D-MOSFET has parameters of VGS(off)= -6V and IDSS = 1 mA. Plot the transconductance curve for the device.

    8. 8 Fig 13.5-6 Example 13.1.(2)

    9. 9 D-MOSFET Transconductance

    10. 10 Fig 13.9 E-MOSFET operation.

    11. 11 Fig 13.10 E-MOSFET transconductance curve.

    12. 12 Fig 13.12 Example 13.2. The spec sheet for the 3N171 lists the following minimum values: IDS(on) = 10 mA at VGS = 10 V and VGS(th) = 1.5 V. Using these ratings, determine the value of ID for the circuit shown in Figure 13.12.

    13. 13 Fig 13.13 Drain-feedback bias.

    14. 14 Other MOSFET Applications Dual-gate MOSFET Power MOSFET LDMOS (lateral double diffused MOSFET) VMOS (V-groove MOSFET) TMOS CMOS (complementary MOSFET)

    15. 15 Dual Gate MOSFET Cascode amplifier Amplitude modulator

    16. 16 Power MOSFET Linear amplifiers. Audiophile amplifiers: www.passdiy.com www.passlabs.com Switching amplifiers. Switching power converters.

    17. 17 CMOS

    18. 18 Summary MOSFET construction and handling. Depletion- and enhancement-type MOSFET. Other MOSFET applications: dual-gate MOSFET Power MOSFET CMOS

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