Stick Diagrams



  4-SNBhat_Stickdiagrams_IUCEEE(1).ppt (Size: 157 KB / Downloads: 1)


Objectives:
To know what is meant by stick diagram.
To understand the capabilities and limitations of stick diagram.
To learn how to draw stick diagrams for a given MOS circuit.

Outcome:
At the end of this module the students will be able draw the stick diagram for simple MOS circuits.



VLSI design aims to translate circuit concepts onto silicon.
stick diagrams are a means of capturing topography and layer information using simple diagrams.
Stick diagrams convey layer information through colour codes (or monochrome encoding).
Acts as an interface between symbolic circuit and the actual layout.


Stick Diagrams – Some rules


Rule 1.
When two or more ‘sticks’ of the same type cross or touch each other that represents electrical contact. 


Rule 2.
When two or more ‘sticks’ of different type cross or touch each other there is no electrical contact. (If electrical contact is needed we have to show the connection explicitly).


Rule 3.
When a poly crosses diffusion it represents a transistor.



Rule 4.
In CMOS a demarcation line is drawn to avoid touching of p-diff with n-diff. All pMOS must lie on one side of the line and all nMOS will have to be on the other side.