chapter 2 mos transistors. 2.2 structure and operation of the mos transistor
TRANSCRIPT
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Chapter 2MOS Transistors
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2.2 STRUCTURE AND OPERATION OF THE MOS TRANSISTOR
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2.2 Structure and Operation of the MOS Transistor
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2.2 Structure and Operation of the MOS Transistor
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2.2 Structure and Operation of the MOS Transistor
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2.3 THRESHOLD VOLTAGE OF THE MOS TRANSISTOR
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2.3 Threshold Voltage of the MOS Transistor
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Intrinsic carrier concentration :
Mass action law :
Difference between intrinsic and actual Fermi level :
p-type material case :
Gate oxide capacitance :
2.3 Threshold Voltage of the MOS Transistor
(2.1)
(2.2)
(2.3a)
(2.3b)
(2.4)
(2.5)
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2.3 Threshold Voltage of the MOS Transistor
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2.3 Threshold Voltage of the MOS Transistor
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2.3 Threshold Voltage of the MOS Transistor
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2.3 MOS Structure2.3.4 The Depletion Approximation
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2.3 MOS Structure2.3.4 The Depletion Approximation
2.47
2.71
2.72
2.73
2.74
2.75
2.76
2.77
2.78
2.79
2.80
2.81
2.82
2.83
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2.3 MOS Structure2.3.4 The Depletion Approximation
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2.84
2.85
2.86
2.87
2.88
2.89
2.90
2.3 MOS Structure2.3.4 The Depletion Approximation
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2.3 MOS Structure2.3.4 The Depletion Approximation
2.91
2.92
2.93
2.94
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Change of Quasi-Fermi Potentials across the Space-Charge Region
17
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Modern VLSI Devices
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Modern VLSI Devices
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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Silicon-gate device work function difference :
Flat-band condition :
Depletion layer(p-type) thickness :
Bulk charge :
(Inversion)
(Body bias)
2.3 Threshold Voltage of the MOS Transistor
(2.6)
(2.7)
(2.8)
(2.9a)
(2.9b)
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Threshold voltage :
Body-effect coefficient(body factor)Flat-band condition :
2.3 Threshold Voltage of the MOS Transistor
(2.10)
(2.11)
(2.12)
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2.4 Effect of Gate-Body Voltage on Surface Condition
2.4.26
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2.3 Threshold Voltage of the MOS Transistor
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2.4 FIRST-ORDER CURRENT-VOLTAGE CHARACTERISTICS
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2.4 First-Order Current-Voltage Characteristics
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Charge area density at the point y :
Drain-source current :
(Carrier velocity : )
2.4 First-Order Current-Voltage Characteristics
(2.13)
(2.14)
(2.15)
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Process transconductance parameter :
Drain-source current :
(Device transconductance parameter : )
2.4 First-Order Current-Voltage Characteristics
(2.16)
(2.17a)
(2.17b)
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2.4 First-Order Current-Voltage Characteristics
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Saturation voltage :
Drain-source current (saturation) :
(Shortening the electrically effective value of L)
2.4 First-Order Current-Voltage Characteristics
(2.18)
(2.19)
(2.20)
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2.4 First-Order Current-Voltage Characteristics
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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2.5 DERIVATION OF VELOCITY-SATURATED CURRENT EQUATION
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2.5.1 Effect of High Fields
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2.5.1 Effect of High Fields
(2.21)
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2.5.1 Effect of High Fields
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Critical field values :
Carrier velocity :
Consider boundary condition :
(2.22)
(2.23a)
(2.23b)
(2.24)
2.5.1 Effect of High Fields
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Linear region operation
2.5.2 Current Equations for Velocity-Saturated Devices
(2.25)
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Saturation region operation
Limiting cases : ( )
( )
(2.26)(2.27)
(2.28)
(2.29)
2.5.2 Current Equations for Velocity-Saturated Devices
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2.5.2 Current Equations for Velocity-Saturated Devices
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5.2 Carrier Velocity Saturation
5.2.16
5.2.17
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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1X devices
2.5.2 Current Equations for Velocity-Saturated Devices
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Equations for deep submicron devices
Saturation region
Channel length modulation
Linear region
2.5.2 Current Equations for Velocity-Saturated Devices
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2.6 ALPHA-POWER LAW MODEL
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2.6 Alpha-Power Law Model
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(2.30a)
(2.30b)
(2.31)
2.6 Alpha-Power Law Model
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2.7 SUBTHRESHOLD CONDUCTION
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2.7 Subthreshold Conduction
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2.5.1 Effect of High Fields
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Current equation:
Slope factor :
2.7 Subthreshold Conduction
(2.32)
(2.33)
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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Copyright © 2004 The McGraw-Hill Companies, Inc. All rights reserved.
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2.8 CAPACITANCES OF THE MOS TRANSISTOR
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2.8 Capacitances of the MOS Transistor
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2.8.1 Thin-Oxide Capacitance
Total capacitance of the thin-oxide :
Examples : i) technology, oxide thickness
ii) process, with
(2.34)
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2.8.1 Thin-Oxide Capacitance
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7.3 A MEDIUM-FREQUENCY SMALL-SIGNAL MODEL FOR THE INTRINSIC PART
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
7.3.1
7.3.2
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
7.3.37.3.4
7.3.5
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
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8.2 A Complete Quasi-Static Model for the Intrinsic Part
8.2.1 Complete Description of Intrinsic Capacitance Effects 8.2.3
8.2.4
8.2.5
8.2.6
8.2.7
8.2.8
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8.2 A Complete Quasi-Static Model for the Intrinsic Part
8.2.1 Complete Description of Intrinsic Capacitance Effects
8.2.9
8.2.10
8.2.11
8.2.12
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8.2 A Complete Quasi-Static Model for the Intrinsic Part
8.2.2 Small-Signal Equivalent Circuit Topologies
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8.2 A Complete Quasi-Static Model for the Intrinsic Part
8.2.2 Small-Signal Equivalent Circuit Topologies
8.2.17
8.2.18
8.2.19a
8.2.19b
8.2.19c
8.2.20
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8.2 A Complete Quasi-Static Model for the Intrinsic Part
8.2.2 Small-Signal Equivalent Circuit Topologies
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
7.3.6
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
7.3.7
7.3.8
7.3.9
7.3.10
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
7.3.11
7.3.12
7.3.13
7.3.14
7.3.15
7.3.16
7.3.17
7.3.18
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
7.3.19
7.3.20
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
• Nonsaturation with VDS = 0 (=1)
• Saturation (=0)
7.3.21
7.3.22
7.3.23, 24
7.3.25
7.3.26
7.3.27
7.3.28
7.3.29
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
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7.3 A Medium-Frequency Small-Signal Model for the Intrinsic Part
ClickIntrinsic+Extrinsic (7.4)
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2.8.1 Thin-Oxide Capacitance
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Current-voltage characteristic :
Built-in junction potential :
2.8.2 pn Junction Capacitance
(2.35)(2.36)
(2.37)
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2.8.2 pn Junction Capacitance
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Junction capacitance :
Zero-bias junction capacitance :
For of the NMOS device :
2.8.2 pn Junction Capacitance
(2.38)
(2.39)
(2.40)
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2.8.2 pn Junction Capacitance
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Total junction capacitance :
Simplification :
( , )
2.8.2 pn Junction Capacitance
(2.41)
(2.42)
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Equivalent voltage-independent capacitance
2.8.2 pn Junction Capacitance
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2.8.2 pn Junction Capacitance
(2.43)
(2.44)
(2.45)
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2.8.3 Overlap Capacitance
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(2.46)
(2.47)
2.8.3 Overlap Capacitance
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2.9 SUMMARY
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2.9 Summary
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2.9 Summary
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2.9 Summary
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2.9 Summary
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2.9 Summary
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2.9 Summary
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2.9 Summary