Design Rules Check (DRC) setup in PCB Design - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the Purpose of DRC Setup

What is the main purpose of setting up Design Rules Check (DRC) in PCB design?

A To generate the bill of materials for the PCB

B To automatically route all PCB traces without errors

C To verify that the PCB layout meets manufacturing and electrical constraints

D To simulate the electrical performance of the PCB

💡 Hint

Think about what ensures the PCB can be manufactured correctly and works as intended.

DRC setup is used to check if the PCB layout follows the rules required for manufacturing and electrical functionality, preventing errors before production.

❓ dax_lod_result

intermediate

Calculating Violations Count in DRC Report

Given a DRC report table with columns RuleType and ViolationCount, which DAX measure correctly sums all violations?

A Total Violations = SUM(DRCReport[ViolationCount])

B Total Violations = COUNT(DRCReport[RuleType])

C Total Violations = AVERAGE(DRCReport[ViolationCount])

D Total Violations = DISTINCTCOUNT(DRCReport[ViolationCount])

💡 Hint

Think about how to add up all violation counts.

SUM adds all values in the ViolationCount column, giving the total number of violations.

❓ visualization

advanced

Best Visualization for DRC Violations by Rule Type

You have a dataset with DRC violations categorized by rule type and severity. Which visualization best helps identify the most frequent and severe violations?

A Pie chart showing percentage of violations by rule type

B Line chart showing violations over time

C Scatter plot of violation locations on PCB layout

D Stacked bar chart showing count of violations by rule type and severity

💡 Hint

Consider a chart that compares categories and subcategories clearly.

A stacked bar chart allows comparison of violation counts by rule type and severity in one view, making it easy to spot the most frequent and severe issues.

🔧 Formula Fix

advanced

Identify the Error in DAX Measure for DRC Violations

Review the following DAX measure intended to calculate total DRC violations filtered by severity 'High':
Total High Violations = CALCULATE(SUM(DRCReport[ViolationCount]), DRCReport[Severity] = "High")
What is the error?

A The measure is correct and will work as intended

B The filter condition should use FILTER function for row context

C Severity column name is incorrect

D SUM cannot be used with CALCULATE

💡 Hint

Confirm if the direct filter in CALCULATE is valid DAX syntax.

The DAX measure is correct. CALCULATE accepts boolean filter expressions like DRCReport[Severity] = "High" directly, which modifies the filter context appropriately.

🎯 Scenario

expert

Optimizing DRC Setup for Complex PCB Designs

You are setting up DRC for a complex multilayer PCB with tight spacing and multiple signal types. Which approach best balances thorough error checking and reasonable run time?

A Run DRC only on the top and bottom layers to save time

B Use rule sets with different strictness for critical and non-critical layers and run incremental DRC during design

C Disable spacing rules to speed up DRC and run full check only before manufacturing

D Set all rules to the strictest values and run full DRC after every design change

💡 Hint

Consider how to keep checks effective but not slow down design work too much.

Using different rule strictness for critical layers and incremental checks balances accuracy and performance, avoiding unnecessary delays.