Complementary Metal-Oxide-Semiconductor Very Large-Scale Integrated Circuit Design
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1 Complementary Metal-Oxide-Semiconductor Very Large-Scale Integrated Circuit Design Bradley A. Minch Mixed Analog-Digital VLSI Circuits and Systems Lab Cornell University Ithaca, NY October 18, 2003
2 1 Simplified Periodic Table of the Elements H Li Na K Rb Cs Be Mg Ca Sr Ba B Al Ga In Tl C Si Ge Sn Pb N P As Sb Bl O S Se Te Po F Cl Br I At Ne Ar Kr Xe Rn He Hydrogen Lithium Sodium Potassium Rubidium Cesium Beryllium Magnesium Calcium Strontium Barium Boron Aluminum Gallium Indium Thallium Carbon Silicon Germanium Tin Lead Nitrogen Phosphorus Arsenic Antimony Bismuth Oxygen Sulfur Selenium Tellurium Polonium Flourine Chlorine Bromine Iodine Astatine Neon Argon Krypton Xenon Radon Helium I II III IV V VI VII VIII
3 Schematic Representation of a Silicon Crystal 2 covalent bond valence electron Si Si Si Si silicon atom Si Si Si Si Si Si intrinsic silicon crystal
4 Electrons and Holes in the Silicon Crystal 3 Si silicon atom (conduction) electron Si Si Si hole Si Si Si Si Si Si intrinsic silicon crystal
5 Electrons and Holes in the Silicon Crystal 3 Si Si Si Si silicon atom electron hole Si Si Si Si Si Si intrinsic silicon crystal
6 Silicon Crystal Doped with Donor Impurities 4 donor atom extra electron (loosely bound) Si P Si P phosphorus atom (donor for silicon) Si Si Si Si Si Si doped silicon crystal: n-type
7 Silicon Crystal Doped with Donor Impurities 4 ionized donor + Si P Si extra proton (space charge) P phosphorus atom (donor for silicon) Si Si Si Si Si Si electron doped silicon crystal: n-type
8 Silicon Crystal Doped with Acceptor Impurities 5 acceptor atom extra hole (easy to fill) Si B Si B boron atom (acceptor for silicon) Si Si Si Si Si Si doped silicon crystal: p-type
9 Silicon Crystal Doped with Acceptor Impurities 5 ionized acceptor extra electron (space charge) B boron atom (acceptor for silicon) Si B Si Si Si Si Si Si Si hole doped silicon crystal: p-type
10 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + drain ionized acceptor gate bulk oxide depletion region ionized donor source n + p -
11 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + n + p -
12 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + n + p -
13 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + n + p -
14 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + n + p -
15 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + n + p -
16 N-Channel Metal-Oxide-Semiconductor Transistor 6 n + n + p -
17 photoresist SiO 2 Oxidize silicon surface and coat with photoresist
18 ultraviolet light mask Pattern and selectively etch oxide layer
19 ion implant photoresist SiO 2 Ion implant for n-well regions
20 n - well SiO 2 Anneal n-well implant and grow oxide
21 nitride n - well SiO 2 Remove all oxide, regrow thin oxide, and deposit nitride layer
22 nitride SiO 2 n - well Pattern and selectively etch oxide and nitride layers
23 nitride n - well SiO 2 Grow field oxide in areas without nitride
24 polysilicon gate oxide n - well field oxide Remove nitride and thin oxide, grow gate oxide, and deposit poly
25 polysilicon n - well Pattern and selectively etch polysilicon
26 photoresist n - well Conformally coat entire surface with photoresist
27 n - well Remove photoresist to expose regions for n + implant
28 n + implant n - well Ion implant for n + regions and remove all photoresist
29 photoresist n - well Conformally coat entire surface with photoresist
30 n - well Remove photoresist to expose regions for p + implant
31 p + implant n - well Ion implant for p + regions and remove all photoresist
32 n - well SiO 2 Deposit thick oxide layer over entire surface
33 p + n + p + n - well SiO 2 n + Anneal and drive in both implants
34 n - well SiO 2 Planarize surface by chemical-mechanical polishing
35 contact holes n - well Open contact windows in the oxide
36 metal1 n - well Fill contact holes with metal and deposit metal1
37 metal1 n - well Pattern and selectively etch metal1
38 SiO 2 metal1 n - well Deposit thick oxide layer over entire surface
39 SiO 2 metal1 n - well Planarize surface by chemical-mechanical polishing
40 via holes n - well Open via windows in the oxide
41 metal2 n - well Fill via holes with metal and deposit metal2
42 metal2 n - well Pattern and selectively remove metal2
43 metal2 SiO 2 n - well Deposit thick oxide layer over entire surface
44 MOS Transistor Circuit Symbols 8 D S G G S nmos transistor D pmos transistor
45 MOS Transistor Switch Networks 9 If we represent a logical 0 by 0V and a logical 1 by V DD, then points X and Y are connected electrically if A X X A X X A B A B B Y Y A B A B A B A B Transistors connected in series implement a logical AND function while transistors connected in parallel implement a logical OR function! B Y Y
46 Simple CMOS Logic Gates: NOT (Z = A) 10 A Z A Z A Z
47 Simple CMOS Logic Gates: NOR (Z = (A B)) 10 A A B Z B Z A B Z
48 Simple CMOS Logic Gates: NAND (Z = (A B)) 10 A B Z B A Z A B Z
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