Do Differential Pairs Need Ground? Are you sure? | Explained by Eric Bogatin

When doing PCB layout and designing boards, many people ask if GND is important for differential pair signals. Here is the answer. Thank you Eric. DesignCon: https://www.designcon.com/ Use 15% DesignCon 2024 Discount coupon: FED24 Other Links: - Eric's Linked In: https://www.linkedin.com/in/eric-bogatin-368860/ - Study High-Speed Digital Engineering at University: https://www.colorado.edu/ecee/academics/graduate-programs/professional-masters/high-speed-digital-engineering - What Decoupling Capacitor Value To Use And Where To Place Them https://youtu.be/ARwBwHZESOY - FEDEVEL courses: https://fedevel.com/courses Chapters: 00:00 What is this video about 01:16 P & N 02:09 Real differential pair vs. two single ended lines 07:11 Differential pair going through a transformer vs. ground 08:35 Are diff pairs routed on board different from diff pairs in cables? 11:42 Differential vs. common 15:12 What if a differential pair doesn't have any return plane - examples explained 17:28 Simulation of a single ended signal vs. return current path 21:05 Simulation differential pair signals vs. return current path 24:04 Tightly vs. loosely coupled differential pairs 28:51 Differential pairs vs. return plane far away 34:03 Example 1: Single ended signal in cable 34:56 Example 2: Single ended vs. differential signal in cable 36:22 Results: Impedance graphs 39:51 Example 3: Single ended vs. differential signal in PCB without GND plane ------------------------------------------------------ Would you like to support me? It's simple: - Sign up for online courses hosted on our platform: https://fedevel.com/ - You can also support me through Patreon: https://www.patreon.com/robertferanec - FEDEVEL Discord: https://discord.gg/8a8dUcHmrx It is much appreciated. Thank you, - Robert