What is a Stick Diagram In VLSI?

What is a Stick Diagram In VLSI?

What is a Stick Diagram In VLSI?

In VLSI, a stick diagram is a diagrammatic representation used for designing transistor cells. It employs “sticks” or lines to represent devices and conductors. The crucial aspects to determine in this diagram are the orientation and metalization of the power supply, ground, input, and output, which collectively form the circuit’s architecture. The stick diagram serves as a symbolic design approach. Let’s explore what is stick diagram in VLSI, how it is incorporated and much more.

How Does A Designer Draw A Stick Diagram?

In the domain of VLSI design, the designer crafts a manual layout by utilizing colored lines to symbolize various process layers, including diffusion (p or n), metal, and polysilicon. The polysilicon layer intersects with the diffusion layer, and metal wires are used to establish distribution or poly connections.

Design rules play a vital role in facilitating communication between the designer, who outlines the requirements, and the fabricator, who brings those ideas to life. The primary objective of VLSI physical design is to transform circuit concepts into silicon reality. Stick diagrams can be employed to visually convey layer information through color coding. For depletion mode transistors, implantation within the thin oxide layer is necessary.

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Stick diagrams are essential for the interface between the designer and the process engineer. Some stick diagram rules are as follows:

  • When multiple sticks of the same type cross or touch each other, it signifies an electrical contact.
  • The crossing of poly over diffusion indicates the presence of a transistor.
  • In CMOS design, a demarcation line is drawn to prevent the overlap of p-diffusion with n-diffusion. All PMOS transistors must be on one side of the line, and all NMOS transistors must be on the other side.

Design rules play a crucial role in translating circuit designs into physical geometry on silicon, acting as an interface between the circuit designer and the fabrication engineer.

What is a Stick Diagram in VLSI Needed For?

Stick diagrams offer a simple and intuitive method for documenting topography and layer details in VLSI design. They utilize color codes or monochrome encoding to represent information about different layers.

Key features of stick diagrams include:

  • Comprehensive display of components and vias, which are metal links connecting higher-level metals.
  • Depiction of the relative positioning of components, providing spatial context.
  • Facilitation in the progression towards the final layout by visually outlining the design’s key aspects.
  • Assistance in planning the layout and routing process, streamlining the design workflow.

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Conclusion

If you’re interested in delving deeper into IC designs and transistors beyond the fundamental understanding of stick diagrams, Chipedge has an abundance of resources to offer. Being the best VLSI training institute in Bangalore, it offers a wide range of VLSI courses online including the basic VLSI course, VLSI design course as well as the best job-oriented courses in Bangalore. Contact us to know more.

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