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.
Chapters:
- 00:00What is this video about
- 00:16P & N
- 02:09Real differential pair vs. two single ended lines
- 07:11Differential pair going through a transformer vs. ground
- 08:35Are diff pairs routed on board different from diff pairs in cables?
- 11:42Differential vs. common
- 15:12What if a differential pair doesn't have any return plane - examples explained
- 17:28Simulation of a single ended signal vs. return current path
- 21:05Simulation differential pair signals vs. return current path
- 24:04Tightly vs. loosely coupled differential pairs
- 28:51Differential pairs vs. return plane far away
- 34:03Example 1: Single ended signal in cable
- 34:56Example 2: Single ended vs. differential signal in cable
- 36:22Results: Impedance graphs
- 39:51Example 3: Single ended vs. differential signal in PCB without GND plane
