How do you reduce resistance in a wire?
- Reduce the run length of metal wire.
- Increase the metal width.
- Change the metal material.
- Run parallel metal.
- Using higher metal layers(M1<M2<M3).
How do you calculate metal width and length?
Metal resistance is very important for chip design. Following is the general formula for calculating metal resistance.
R = ρL/A
It has a length of L (meters), a cross-sectional area of A (meters^2), and a resistivity coefficient ρρ (m*ΩΩ).
What increases wire resistance?
- Using conductive material of a higher resistivity
- Making the wire very thinner(lower metals)
- Making the wire long length
What is the greatest effect on the resistance of a wire?
The resistance of the wire increases with an increase in temperature. The resistance of the wire also changes with frequency. The higher the operating frequency, the higher the resistance. This is because of the skin effects.
If a wire of resistance R and now if we make half its length, what will the new resistance be?
Its answer is R/4.
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