lecture 8- introduction to cad lecture 8- introduction to cad dr. mohamed refky amin electronics and...
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Lecture 8- Introduction to CAD
Dr. Mohamed Refky Amin
Electronics and Electrical Communications Engineering Department (EECE)
Cairo University
http://scholar.cu.edu.eg/refky/
Outline of this Lecture
• Previously on ELCN321
• Computer Aided Design
• L-Edit
• Layout of an inverter
Dr. Mohamed Refky
Previously on ELCN321
Dr. Mohamed Refky
Layout Design Rules
Previously on ELCN321
Dr. Mohamed Refky
Layout Design Rules
Previously on ELCN321
Dr. Mohamed Refky
Layout Design Rules
Previously on ELCN321
Stick diagrams are easy and fast way for the designers to plan
cells and estimate area before committing to a full layout.
Dr. Mohamed Refky
Stick Diagrams
Computer Aided Design
Computer aided design (CAD) is the use of computer systems (or
workstations) to aid in the creation, modification, analysis, or
optimization of a design.
CAD software is used to increase the productivity of the designer
and improve the quality of design
Electronic design automation (EDA) is a category of CAD tools
for designing electronic systems such as integrated circuits and
printed circuit boards. Since a modern semiconductor chip can
have billions of components, EDA tools are essential for their
design.
Dr. Mohamed Refky
Definition
Computer Aided Design
Since a modern semiconductor chip can have billions of
components, EDA tools are essential for their design.
Example of the CAD companies are: Cadence, Mentor Graphics
Synopsis, and Tanner.
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Definition
L-Edit
L-Edit is an integrated circuit layout toolfrom Tanner used to draw twodimensional geometry of the masks usedto fabricate an integrated circuit.
Different layers are represented bydifferent colors and patterns.
Manufacturing constraints can be definedin L-Edit as design rules.
L-Edit files are saved as file_name.tdb(Tanner Database).
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Definition
L-Edit
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L-Edit Modules
L-Edit
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L-Edit Main WindowMenu Bar
Toolbars
Layer
Palette
Mouse
Buttons
Drawing
windows
L-Edit
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L-Edit Toolbars
New
Save
OpenPrint
Cut
Copy
Paste
Undo
Redo
Find
Zoom
Hierarchy
Level
Open
Cell
Copy
Cell
User
Guide
Duplicate
Rotate
Horizontal
Flip
Vertical Flip
Nibble
Horizontal
Slice
Vertical
Slice
Merge
Group
Ungroup
DRC
Extract
L-Edit
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L-Edit Toolbars
Select
Polygon
(90o)
Rectangular
BoxPolygon
(45o)
Polygon
(all angle)
Wire Width
Wire
(90o)
Wire
(45o)
Wire
(all angle) Circle
Arc
Torus
Port
Ruler
(90o)
Ruler
(45o)
Ruler
(all angle)
Instance
L-Edit
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Setting Technology File
C:\Documents and Settings\Owner\My Documents\Tanner EDA\Tanner
Toolsv15.0\Process\MOSIS_Scalable_HP_500nm\MOSIS_Scalable_HP_500nmTec
h\mhp_n05.tdb
L-Edit
Dr. Mohamed Refky
L-Edit
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L-Edit
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Setting Grid
L-Edit
To set grid, follow the following
steps:
Under Mouse grid: set “Mouse
snap grid” to 0.5 Lambda
Dr. Mohamed Refky
Setting Grid
L-Edit
Draw the layout of a minimum size CMOS inverter
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Example