Difference between Layout and Schematic
The difference between Layout and Schematic is Layout is a Physical representation of a Schematic and Schematic is a topological representation of the circuit.
A geometric model of the circuit is called layout (circuit board layout). It is mainly meant for fabrication. If necessary, various layouts for the same schematic can be created. Schematics are simpler to read and comprehend when compared to layout, yet they may not always provide a complete picture of the circuit’s physical implementation.
The schematic is a drawing that shows the logical connections between the components. In essence, it demonstrates how the parts are electrically connected. A netlist, a straightforward data structure seen in a schematic, is used to list each connection in the design according to the drawing’s specifications. A schematic diagram is given in the figure below.
Rules to draw a schematic
- Put the outputs on the right and the inputs to the left.
- Design functional blocks in the schematic parts.
- Pin numbers should always be placed outside any symbol graphics.
- It is best to write the pin numbers, polarity, values, and net names horizontally.
- Symbols for sheet connections should always be positioned on the page’s extreme left- or right-hand edges.
Rules to Draw a Layout
- Give Nwell to Nwell more space
- Avoid jogs in metal
- Try to maintain the same environment in Layout
- Put more number of vias
- Use proper power mesh
- Share the same diffusion
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