08/10/2024
Did you know?
Most PCB traces are routed at 45-degree angles rather than 90 degrees, and it's not just for aesthetics! This design choice actually has some critical benefits, especially in high-frequency RF circuits. Here’s the reason engineers avoid sharp 90 degree turns in PCB layouts.
When a trace turns at a 90 degree angle, it disrupts the flow of current by creating a “corner” effect that can lead to signal reflection and impedance mismatch. This means that signals, especially high-frequency ones, might get distorted or even lost a huge headache for RF circuits or high-speed digital designs. In contrast, a 45 degree turn allows for a more gradual change in direction, which helps minimise signal reflection and keeps the impedance steady.
Moreover, 45 degree angles also contribute to better manufacturability. Sharp 90 degree corners can trap etching chemicals during production, which can lead to issues with the trace width or even cause short circuits. Using 45 degree angles can help improve yield and reduce the risk of costly manufacturing defects.
Now you know why.
