Controlled Impedance Routing Using Altium Designer | Sierra Circuits
Channel: Sierra Circuits
Date: 15/02/2021

In this demo, we show you how to route a differential pair with 100 ohms and a single-ended line with 50 ohms using Altium Designer.

Controlled impedance is the characteristic impedance of a transmission line formed by PCB traces and its associated reference planes. It is relevant when high-frequency signals are propagating on the PCB transmission line.  

Controlled impedance is important for solving signal integrity issues, which is the propagation of signals in PCB traces without distortion.

Let’s take you through the following steps to achieve the desired impedances for single-ended and differential traces using Altium Designer:

1. Class creation for controlled impedance routing
2. Rule setup for differential pair (100 ohms) routing 
3. Rule setup for single-ended (50 ohms) line 
4. Differential pair routing
5. Single-ended routing

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