Guard traces for sensitive signals in PCB Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a guard trace around a sensitive signal.

PCB Design

guard_trace_width = [1]  // width in mils for the guard trace

Drag options to blanks, or click blank then click option'

A200

B10

C50

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing too narrow a width reduces shielding effectiveness.

Choosing too wide wastes PCB area.

A typical guard trace width is around 50 mils to effectively shield sensitive signals without taking excessive board space.

2fill in blank

medium

Complete the code to set the clearance between the guard trace and the sensitive signal trace.

PCB Design

clearance = [1]  // clearance in mils between guard and signal

Drag options to blanks, or click blank then click option'

A20

B50

C5

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Setting clearance too small causing noise.

Setting clearance too large reducing guard effectiveness.

A clearance of about 20 mils is typical to prevent capacitive coupling while maintaining effective shielding.

3fill in blank

hard

Fix the error in the guard trace connection code to ensure proper grounding.

PCB Design

if guard_trace_connected_to != '[1]':
    raise ValueError('Guard trace must connect to ground')

Drag options to blanks, or click blank then click option'

Apower

Bfloating

Csignal

Dground

Attempts:

3 left

💡 Hint

Common Mistakes

Connecting guard trace to power instead of ground.

Leaving guard trace floating.

Guard traces must be connected to ground to provide effective shielding and reduce noise.

4fill in blank

hard

Fill both blanks to define the guard trace layer and its width.

PCB Design

guard_trace_layer = '[1]'
guard_trace_width = [2]  // in mils

Drag options to blanks, or click blank then click option'

ATop

BBottom

C50

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing Bottom layer when signal is on Top.

Using too wide or too narrow width.

Guard traces are often placed on the Top layer with a width of 50 mils for effective shielding.

5fill in blank

hard

Fill all three blanks to create a guard trace dictionary with layer, width, and clearance.

PCB Design

guard_trace = {
    'layer': '[1]',
    'width': [2],
    'clearance': [3]
}

Drag options to blanks, or click blank then click option'

ATop

B50

C20

DBottom

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing layer names.

Using incorrect numeric values for width or clearance.

This dictionary correctly defines a guard trace on the Top layer with 50 mil width and 20 mil clearance.