Impedance-controlled traces in PCB Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the characteristic impedance of a microstrip trace using the simplified formula.

PCB Design

Z0 = 87 / sqrt([1] + 1.41) * log10(5.98 * h / (0.8 * w + t))

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Aer

Bfrequency

Clength

Dvoltage

Attempts:

3 left

💡 Hint

Common Mistakes

Using frequency instead of dielectric constant

Confusing length with dielectric constant

The characteristic impedance depends on the dielectric constant (er) of the substrate.

2fill in blank

medium

Complete the code to calculate the effective dielectric constant for a microstrip trace.

PCB Design

e_eff = ([1] + 1) / 2 + ([1] - 1) / 2 * (1 / sqrt(1 + 12 * h / w))

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Afrequency

Ber

Cimpedance

Dcapacitance

Attempts:

3 left

💡 Hint

Common Mistakes

Using impedance instead of dielectric constant

Using frequency incorrectly

The effective dielectric constant is calculated using the substrate dielectric constant (er).

3fill in blank

hard

Fix the error in the formula to calculate the impedance of a stripline trace.

PCB Design

Z0 = 60 / sqrt([1]) * log(4 * h / (0.67 * w + t))

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Afrequency

Bvoltage

Clength

Der

Attempts:

3 left

💡 Hint

Common Mistakes

Using frequency or length instead of dielectric constant

Misplacing variables in the formula

The impedance formula requires the dielectric constant (er) under the square root.

4fill in blank

hard

Fill both blanks to complete the formula for impedance of a coplanar waveguide.

PCB Design

Z0 = [1] / sqrt([2]) * K(k') / K(k)

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A30 * pi

Ber

Cfrequency

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Using 60 instead of 30 * pi

Using frequency instead of dielectric constant

The formula uses 30 * pi in the numerator and the dielectric constant (er) under the square root.

5fill in blank

hard

Fill all three blanks to complete the formula for microstrip impedance considering trace thickness.

PCB Design

Z0 = [1] / sqrt([2]) * log(1 + 4 * h / ([3] + t))

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

A60

Ber

Cw

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using 30 instead of 60

Confusing trace width with thickness

Using frequency instead of dielectric constant

The formula uses 60 in the numerator, dielectric constant (er) under the root, and trace width (w) in the denominator inside the log.