Key Considerations for PCB Design Optimization

Are you unsure about which aspects of your PCB design to focus on—layout, wiring, or electromagnetic compatibility? Here are some key points to consider:

1. Partition Method 1

• Signal Return Path: Understanding where the signal current returns to ground is crucial for optimizing mixed-signal board designs.
• Ground Division: Properly connecting divided grounds through a single point can minimize loop area and reduce interference.
• Signal Handling: Consider using optical isolators, transformers, or differential signaling to manage signals across divided grounds effectively.

2. Dividing Method 2

• Unified Ground: Utilizing a unified ground with separate analog and digital sections can prevent digital-to-analog interference.
• Layout Importance: Proper layout and partition of components are essential to ensure digital ground currents do not interfere with analog signals.
• Wiring Rules: Adhering to proper wiring rules is crucial to maintain the integrity of the circuit board design.

3. A/D Partition

• Ground Connection: Connecting analog and digital grounds under A/D converters to the same low impedance ground is recommended to avoid introducing digital noise into analog circuitry.
• Unified Ground Approach: Using a unified ground divided into analog and digital sections aligns with IC manufacturers’ requirements and helps prevent the formation of loop antennas on the PCB.