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发表于 2011-4-17 03:59:54
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Chapter 2 Design Synthesis 71
2.1 Synthesis and Architecture of a Semiconductor Chip for ESD Protection 71
2.2 Electrical and Spatial Connectivity 72
2.2.1 Electrical Connectivity 72
2.2.2 Thermal Connectivity 73
2.2.3 Spatial Connectivity 73
2.3 ESD, Latchup, and Noise 73
2.3.1 Noise 74
2.3.2 Latchup 75
2.4 Interface Circuits and ESD Elements 75
2.5 ESD Power Clamps Networks 78
2.5.1 Placement of ESD Power Clamps 80
2.6 ESD Rail-to-Rail Devices 82
2.6.1 Placement of ESD Rail-to-Rail Networks 84
2.6.2 Peripheral and Array I/O 84
2.7 Guard Rings 87
2.8 Pads, Floating Pads, and No Connect Pads 88
2.9 Structures Under Bond Pads 88
2.10 Summary and Closing Comments 90
Problems 90
References 91
Chapter 3 Electrostatic Discharge (ESD) Design: MOSFET Design 95
3.1 Basic ESD Design Concepts 95
3.1.1 Channel Length and Linewidth Control 102
3.1.2 ACLV Control 103
3.1.3 MOSFET ESD Design Practices 107
3.2 ESD MOSFET Design: Channel Width 109
3.2.1 n-Channel MOSFET Design: Channel Width 109
3.3 ESD MOSFET Design: Contact 109
3.3.1 Gate-To-Contact Spacing 110
3.3.2 Contact-To-Contact Space 114
3.3.3 End Contacts 118
3.3.4 Contacts to Isolation Edge 118
3.4 ESD MOSFET Design: Metal Distribution 119
3.4.1 MOSFET Metal Bus Design and Current Distribution 119
3.4.2 MOSFET Ladder Network Model 119
3.4.3 MOSFET Wiring: Anti-Parallel Current Distribution 123
3.4.4 MOSFET Wiring: Parallel Current Distribution 126
3.5 ESD MOSFET Design: Silicide Masking 129
3.5.1 Silicide Mask Design 129
3.5.2 Silicide Mask Design Over Source and Drain 130
3.5.3 Silicide Mask Design Over Gate 131
3.5.4 Silicide and Segmentation 132
3.6 ESD MOSFET Design: Series Cascode Configurations 133
3.6.1 Series Cascode MOSFET 133
3.6.2 Integrated Cascode MOSFETs 134
3.7 ESD MOSFET Design: Multi-Finger Design Integration of
Coupling and Ballasting Techniques 137
3.7.1 Grounded-Gate Resistor-Ballasted MOSFET 137
3.7.2 Soft Substrate Grounded-Gate Resistor-Ballasted MOSFET 139
3.7.3 Gate-Coupled Domino Resistor-Ballasted MOSFET 140
3.7.4 MOSFET Source-Initiated Gate-Bootstrapped Resistor-
Ballasted multi-Finger MOSFET With MOSFET 142
3.7.5 MOSFET Source-Initiated Gate-Bootstrapped Resistor
Ballasted Multi-Finger MOSFET With Diode 143
3.8 ESD MOSFET Design: Enclosed Drain Design Practice 144
3.9 ESD MOSFET Interconnect Ballasting Design 145
3.10 ESD MOSFET Design: Source and Drain Segmentation 147
3.11 Summary and Closing Comments 148
Problems 149
References 150
Chapter 4 Electrostatic Discharge (ESD) Design: Diode Design 153
4.1 ESD Diode Design: ESD Basic 153
4.1.1 Basic ESD Design Concepts 153
4.1.2 ESD Diode Design: ESD Diode Operation 155
4.2 ESD Diode Design: Anode 156
4.2.1 pþ Diffusion Anode Width Effect 156
4.2.2 pþ Anode Contacts 158
4.2.3 pþ Anode Silicide to Edge Design 158
4.2.4 pþ Anode to nþ Cathode Isolation Spacing 160
4.2.5 pþ Anode Diode End Effects 160
4.2.6 Circular and Octagonal ESD Diode Design 162
4.3 ESD Diode Design: Interconnect Wiring 162
4.3.1 Parallel Wiring Design 163
4.3.2 Anti-Parallel Wiring Design 164
4.3.3 Quantized Tapered Parallel and Anti-Parallel Wiring 164
4.3.4 Continuous Tapered Anti-Parallel and Parallel Wiring 164
4.3.5 Perpendicular (or Broadside) Wiring with Center-Fed Design 165
4.3.6 Perpendicular (or Broadside) with Uniform Metal Width 166
4.3.7 Perpendicular (or Broadside) Wiring with T-Shaped Extensions 167
4.3.8 Metal Design for Structures Under Bond Pads 168
4.4 ESD Diode Design: Polysilicon-Bound Diode Designs 168
4.4.1 ESD Design Issues with Polysilicon-Bound Diode Structures 170
4.5 ESD Diode Design: n-Well Diode Design 171
4.5.1 n-Well Diode Wiring Design 171
4.5.2 n-Well Contact Density 172
4.5.3 n-Well ESD Design, Guard Rings, and Adjacent Structures 173
4.6 ESD Diode Design: nþ/p Substrate Diode Design 175
4.7 ESD Diode Design: Diode String 175
4.7.1 ESD Design: Diode String Current–Voltage Relationship 178
4.7.2 ESD Design: Diode String Design—Architecture and the Design 183
4.7.3 Diode String Elements in Multiple I/O Environments 183
4.7.4 Integration of Signal Pads 184
4.7.5 ESD Design: Diode String Design—Darlington Amplification 186
4.7.6 ESD Design: Diode String Design—Area Scaling 192
4.8 ESD Diode Design: Triple-Well Diodes 193
4.9 ESD Design: BiCMOS ESD Design 198
4.9.1 pþ/n-Well Diode ESD Structure with High Resistance
Implanted Sub-Collector 199
4.9.2 STI-Bound pþ/n-Well Diode with Deep Trench
(DT) Isolation Structure 200
4.9.3 STI-Bound pþ/n-Well Diode with Trench Isolation
(TI) Structure 201
4.10 Summary and Closing Comments 203
Problems 203
References 204 |
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