Question 19.5: In the layout of Fig. 19.44, a 100-μm metal 4 line is connec...

In the layout of Fig. 19.44, a 100-μm metal 4 line is connected to a sequence of vias and contacts to reach the gate of a transistor. Calculate the thermal noise contributed by the line and the contacts.

19.44
The blue check mark means that this solution has been answered and checked by an expert. This guarantees that the final answer is accurate.
Learn more on how we answer questions.

Assuming R_{\square } = 40 mΩ/\square for metal 4, a via resistance of 5 Ω, and a poly contact resistance of 30 Ω, we have R_{tot} = 2 + 2.5 + 2.5 + 2.5 + 15 = 24.5 Ω. The thermal noise voltage is thus equal to 0.64  nV/\sqrt{Hz} at room temperature. If guiding the input signal to a low-noise amplifier, this interconnect arrangement considerably raises the input-referred noise.

Related Answered Questions