Power integrity basics in PCB Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the voltage drop across a power plane.

PCB Design

voltage_drop = current [1] resistance

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A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication

Using division which is incorrect for voltage drop calculation

The voltage drop across a power plane is calculated by multiplying the current by the resistance (Ohm's Law).

2fill in blank

medium

Complete the code to calculate the impedance of a power delivery network (PDN) at a given frequency.

PCB Design

impedance = resistance + [1] * reactance

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

A/

B*

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Adding reactance directly without considering sign

Multiplying reactance incorrectly

Impedance is the sum of resistance and reactance, but reactance is multiplied by the imaginary unit j, which is represented here as multiplication for simplification.

3fill in blank

hard

Fix the error in the code to calculate the decoupling capacitor impedance at frequency f.

PCB Design

impedance = 1 / (2 * 3.1416 * [1] * capacitance)

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

Afrequency

Bvoltage

Cinductance

Dresistance

Attempts:

3 left

💡 Hint

Common Mistakes

Using resistance or inductance instead of frequency

Confusing voltage with frequency

The impedance of a capacitor is calculated as 1 divided by (2π × frequency × capacitance).

4fill in blank

hard

Fill both blanks to create a dictionary of power plane impedance values filtered by frequency greater than 100MHz.

PCB Design

impedance_dict = {freq: [1] for freq, [2] in impedance_data.items() if freq > 100e6}

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Aimpedance

Bvalue

Cimpedance_value

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names causing errors

Not filtering frequencies correctly

The dictionary comprehension extracts impedance values for frequencies above 100MHz. 'value' is the variable unpacked from items(), and 'impedance' is the value to store.

5fill in blank

hard

Fill all three blanks to calculate the total power noise as the sum of voltage noise, current noise, and thermal noise.

PCB Design

total_noise = [1] + [2] + [3]

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

Avoltage_noise

Bcurrent_noise

Cthermal_noise

Dpower_noise

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names

Omitting one or more noise components

The total power noise is the sum of voltage noise, current noise, and thermal noise components.