Power plane design in PCB Design - Real Business Scenario

Scenario Mode

👤 Your Role: You are a PCB design engineer at an electronics manufacturing company.

📋 Request: Your manager wants you to analyze the power plane design of a new PCB to ensure optimal power distribution and minimal noise for the high-speed digital circuit.

📊 Data: You have data on the PCB layers, power plane dimensions, current loads for each section, and measured voltage drops across the power plane.

🎯 Deliverable: Create a report with visualizations showing power plane current distribution, voltage drop heatmap, and recommendations for improving the power plane design.

Sample Data

Section	Layer	Area (cm²)	Current Load (A)	Voltage Drop (mV)
1	Top	10	2.5	15
2	Top	8	3.0	20
3	Inner1	12	1.5	10
4	Inner1	9	2.0	12
5	Bottom	11	1.0	8
6	Bottom	7	2.8	18

1

Step 1: Calculate current density for each section by dividing Current Load by Area.

Current Density (A/cm²) = Current Load (A) / Area (cm²)

Expected Result

Section 1: 0.25 A/cm², Section 2: 0.375 A/cm², Section 3: 0.125 A/cm², Section 4: 0.222 A/cm², Section 5: 0.091 A/cm², Section 6: 0.4 A/cm²

2

Step 2: Create a bar chart showing Current Density by Section with sections on X-axis and current density on Y-axis.

Bar chart config: X-axis = Section, Y-axis = Current Density (A/cm²), color by Layer

Expected Result

Bar chart displays current density values for each section, highlighting Section 6 as highest.

3

Step 3: Create a heatmap visualization of Voltage Drop by Section and Layer to identify areas with high voltage drop.

Heatmap config: Rows = Layer, Columns = Section, Values = Voltage Drop (mV), color gradient from green (low) to red (high)

Expected Result

Heatmap shows Section 2 and Section 6 with highest voltage drops in red.

4

Step 4: Analyze the data to identify sections with high current density and high voltage drop that may cause power integrity issues.

Compare current density and voltage drop values to find critical sections.

Expected Result

Sections 2 and 6 have both high current density and high voltage drop, indicating potential design issues.

5

Step 5: Prepare recommendations to improve power plane design, such as increasing copper area in critical sections or adding vias for better current distribution.

Recommendations based on data analysis and best practices for power plane design.

Expected Result

Report includes suggestions to increase area in Section 6 and add thermal relief vias in Sections 2 and 6.

Final Result

Section 1

↓

Section 2

↓

Section 3

↓

Section 4

↓

Section 5

↓

Section 6

✓Sections 2 and 6 have the highest current density and voltage drop, indicating potential hotspots.

✓Increasing copper area or adding vias in these sections can improve power distribution.

✓Other sections have moderate current density and voltage drop, showing balanced design.

Bonus Challenge

Create a DAX measure or SQL query to calculate the average voltage drop per layer and visualize it in a line chart.

Show Hint

Group data by Layer, then calculate AVG(Voltage Drop). Use this to plot trends across layers.