How to calculate interconnect Wire Resistance

An interconnect wire with a length of L, a width of W, and a thickness of T has a resistance of R given by

[terminal]R = ρL/A= ρL/TW[/terminal]

where ρ is the resistivity of the material of which the wire is made. The quantity ρ/T is called the sheet resistance and has the dimension of ohms, although it is usually expressed as ohms/square.

Where:

For interconnect wires, you’ll need to consider the specific geometry and material properties of the wires you’re working with.

1. Resistivity ($\rho$): This is a property of the material the wire is made from. It’s typically provided in ohm-meters ($\Omega \cdot m$).
2. Length ($L$): Measure the length of the wire along its path.
3. Cross-Sectional Area ($A$): The cross-sectional area of the wire can be calculated using the formula for the area of a circle:

What are various types of parasitic effects introduced by interconnects in integrated circuits?

Interconnects in an integrated circuit introduces three types of parasitic effects: capacitive parasitics, resistive parasitics, and inductive parasitics. These parasitic effects have multiple impacts on the circuit’s behavior:

1. They cause an increase in propagation delay, consequently lowering performance.
2. They affect energy dissipation and power distribution.
3. They introduce extra noise sources, influencing the reliability of the circuit.