- #1

Callum Plunkett

- 27

- 8

## Homework Statement

A transmission line is formed by two identical parallel tracks in a printed circuit board. The line has a length of 50 mm and all line terminations are of 70 Ω. The line can be assumed to be lossless.

calculate the magnitude of the NEXT and FEXT voltages generated in the victim conductor when the source voltage, Vin, in the aggressor conductor is a voltage step of 2 V with a rise time of 100 ps.

## Homework Equations

Vs = Vin x Rin/(Rin+Zo)

Kne =Vp/4 (CmZo + Lm/Zo)

Vne = Kne (Vs(t) - Vs(t-2td)

Kfe = 1/2(CmZo - Lm/Zo)

Vfe = Kfe x length (d/dt)[Vs(t-td)]

## The Attempt at a Solution

Zo = root L/C = 70.7Ohms

Vp = 1/root LC = 17677695

Vs = Vin x Rin/(Rin+Zo) = 0.995v

Kne =Vp/4 (CmZo + Lm/Zo) = 0.08

I start to struggle with the next part (assuming the previous are correct) in regard to t and 2td. I'm sure from my notes t=vp but I'm unable to find the page any more and so I'm unable to verify this.

Vne = Kne (Vs(t) - Vs(t-2td) = 0.08

Again I'm struggling to find d and dt in regard to Far end

Kfe = 1/2(CmZo - Lm/Zo) = 3.99515E9

Vfe = Kfe x length (d/dt)[Vs(t-td)]

Any help would be much appreciated.