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VLSI Design (UNIT II)

Kalyan Acharjya (kalyan.acharjya@gmail.com)

kalyan5.blogspot.in

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Disclaimer

All Contents are collected from various sources (Internet).

Thank you to all respective original owners.

Only for academic use.

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UNIT 2 (MOS MODELING) STICK DIAGRAM MOS LAYOUT

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Stick Diagram and Representation 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 cutdepletion implantBuried contact cutMetal-1

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Mask Layout Encoding for Different Layers N Type diffusion

P -Type diffusion

Polysilicon

Metal 1

Contact Cut

Ion implantation

Buried contact

VDD or VSS contact

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Stick Diagram 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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Stick Diagram & Corresponding Mask Layout

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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Stick Diagram & Corresponding Mask Layout Depletion

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Stick Diagram of NMOS & PMOS

P-Well Area

N-Well Area

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N-MOS (Enhancement & Depletion)

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Complete n-MOS-Stick Diagram

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CMOS Inverter

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Layout & Stick Diagram of CMOS Inverter

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Depletion Load Inverter

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CMOS-2 Input NAND & NOR GATE

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Stick Diagram of CMOS NAND Gate-Euler’s Path

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Example:

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Example 3-Eular Path:

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Example 3-Stick Diagram

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Example: z=(DC+A+B)bar

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One More Example

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BAS HO GAYA…..!Boys Girls

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Thank you for your kind attention !