Introduction to Stick Diagram, VLSI Design, Any Questions related to MOS Transistor and VLSI Design, Write in the Comment Box Below.

1. VLSI Design (UNIT II)
Kalyan Acharjya (kalyan.acharjya@gmail.com)
2/19/20171
kalyan5.blogspot.in
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2. Disclaimer
2/19/20172
All Contents are collected from various sources
(Internet).
Thank you to all respective original owners.
Only for academic use.
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3. UNIT 2 (MOS MODELING)
 STICK DIAGRAM
 MOS LAYOUT
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4. Stick Diagram and Representation
2/19/20174
 A stick diagram is a stick representation for the
layout and represented by simple lines.
 It shows all components with relative placement.
 It does not show exact placement, transistor sizes,
wire lengths, wire widths, tub boundaries.
n-diffusion (device well, local interconnect)
Polysilicon (gate electrode, interconnect)
metal (contact, interconnect)
simple contact cut
depletion implant
Buried contact cut
Metal-1
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5. Mask Layout Encoding for Different Layers
2/19/20175
 N Type diffusion
 P -Type diffusion
 Polysilicon
 Metal 1
 Contact Cut
 Ion implantation
 Buried contact
 VDD or VSS contact
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6. Stick Diagram
2/19/20176
 Stick diagrams help plan layout quickly
 Need not be to scale
 Draw with color pencils or dry-erase markers
 Metal
 Polysilicon
 Metal Contact
 P-Doping
 N-Doping
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7. Stick Diagram & Corresponding Mask
Layout
2/19/20177
Layout: Do not forget the
implants for depletion mode
transistors and to write in the
length to width (L:W) ratio for
each transistor
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8. Stick Diagram & Corresponding Mask
Layout  Depletion
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9. Stick Diagram of NMOS & PMOS
2/19/20179
P-Well Area
N-Well Area
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10. N-MOS (Enhancement & Depletion)
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11. Complete n-MOS-Stick Diagram
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12. CMOS Inverter
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13. Layout & Stick Diagram of CMOS Inverter
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14. Depletion Load Inverter
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15. CMOS-2 Input NAND & NOR GATE
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16. Stick Diagram of CMOS NAND Gate-
Euler’s Path
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17. Example:
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18. Example 3-Eular Path:
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19. Example 3-Stick Diagram
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20. Example: z=(DC+A+B)bar
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21. One More Example
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22. BAS HO GAYA…..!
2/19/201722
Boys Girls
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23. Thank you for your kind attention !
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