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[ METAL-OXIDE SEMICONDUCTOR FIELD
EFFECT TRANSISTOR ]](https://image.slidesharecdn.com/mosfets-170424075315/75/Mosfet-s-1-2048.jpg)
Uploaded byIshwar Bhoge
Mosfet’s
The document discusses two types of MOSFETs: depletion mode (d-MOSFET) and enhancement mode (e-MOSFET). It explains their construction, basic operations, and key characteristics, including how current varies based on gate-source voltage (Vgs) for both n-channel and p-channel MOSFETs. Additionally, relevant transfer curves and operational equations are provided for both modes.
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Introduction to Metal-Oxide Semiconductor Field Effect Transistor (MOSFET).
There are two main types of MOSFETs: Depletion mode (D-MOSFET) and Enhancement mode (E-MOSFET).
D-MOSFET comprises n-doped regions connected by an n-channel, insulated from the Gate via SiO2.
D-MOSFET can operate in two modes: Depletion mode and Enhancement mode.
Transfer characteristics for Depletion Mode operation showing relationships of VGS and ID.
Enhancement Mode operation includes positive VGS, increasing ID above IDSS using Shockley’s equation.
p-channel D-MOSFET operates similarly to n-channel; however, polarities and currents are reversed.
Symbols representing different types of D-MOSFETs.
Specification sheet reference, dated January 2004.
Introduction to Enhancement Mode MOSFETs.
Illustration of n-channel E-MOSFET demonstrating channel length (L) and width (W).
E-MOSFET construction varies; n-doped regions and Gate connection details described.
Enhancement Mode operates positively with VGS, ID increases as VGS exceeds threshold (VT).
p-channel E-MOSFET comparison to n-channel, focusing on reversed polarities and directions.
Symbols representing various types of E-MOSFETs.
Specification sheet details for MOSFET.
Overview of different packages available for MOSFETs.
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Mosfet’s
- 1. MOSFET’S [ METAL-OXIDE SEMICONDUCTORFIELD EFFECT TRANSISTOR ]
- 2. MOSFET’S There are2 types of MOSFET’s: • Depletion mode MOSFET (D-MOSFET) • N-channel D-Type MOSFET • P-channel D-Type MOSFET • Enhancement Mode MOSFET (E-MOSFET)
- 3. DEPLETION MODE MOSFETCONSTRUCTION • The Drain (D) and Source (S) leads connect to the to n-doped regions • These N-doped regions are connected by an n-channel • This n-channel is connected to the Gate (G) via a thin insulating layer of SiO2 • The n-doped material lies on a p-doped substrate that may have an additional terminal connection called SS
- 4. BASIC OPERATION D-MOSFET maybe biased to operate in two modes: • The Depletion mode or The Enhancement mode
- 5. D-MOSFET DEPLETION MODEOPERATION The transfer characteristics are similar to the JFET In Depletion Mode operation: When VGS = 0V, ID = IDSS When VGS < 0V, ID < IDSS When VGS > 0V, ID > IDSS The formula used to plot the Transfer Curve, is: 2 GS D DSS P V I = I 1- V
- 6. D-MOSFET ENHANCEMENT MODEOPERATION Enhancement Mode operation In this mode, the transistor operates with VGS > 0V, and ID increases above IDSS Shockley’s equation, the formula used to plot the Transfer Curve, still applies but VGS is positive: 2 GS D DSS P V I = I 1- V
- 7. p-Channel Depletion ModeMOSFET The p-channel Depletion mode MOSFET is similar to the n-channel except that the voltage polarities and current directions are reversed
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- 11. n-Channel E-MOSFET showingchannel length L and channel width W
- 12. Enhancement Mode MOSFETConstruction The Drain (D) and Source (S) connect to the to n-doped regions These n-doped regions are not connected via an n-channel without an external voltage The Gate (G) connects to the p-doped substrate via a thin insulating layer of SiO2 The n-doped material lies on a p-doped substrate that may have an additional terminal connection called SS
- 13. Basic Operation The Enhancementmode MOSFET only operates in the enhancement mode. VGS is always positive IDSS = 0 when VGS < VT As VGS increases above VT, ID increases If VGS is kept constant and VDS is increased, then ID saturates (IDSS) The saturation level, VDSsat is reached.
- 14. p-Channel Enhancement ModeMOSFETs The p-channel Enhancement mode MOSFET is similar to the n-channel except that the voltage polarities and current directions are reversed.
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- 17. SOME PACKAGES OFMOSFET