The Importance of Dual Power Supplies in PCB Design

In PCB design, the analog section requires dual positive and negative supplies to function effectively. While digital speed requirements are not as demanding, choosing the right option can impact overall performance.

Consideration of Two Layer Stack Options:

• Option A:
  • Signals and SMD components
  • GND fill
  • Crossing signals
  • +VE and -VE power, and 3.3V digital routed separately
• Option B:
  • Signals and SMD components
  • GND fill
  • +VE and -VE fills with some crossing signals

When routing high-speed signals across different reference planes with vias, using stitching capacitors becomes crucial to maintain signal integrity.

For a visual representation, refer to the image below: