Broadside Coupled Trace Inductance Calculator

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When designing high-frequency circuits, the inductance of traces becomes a crucial factor in determining performance. The Broadside Coupled Trace Inductance Calculator is a free online tool that helps engineers and designers calculate the inductance of coupled traces, which are traces that run parallel to each other on different layers of a PCB.

Understanding Broadside Coupled Inductance

In broadside coupling, two traces are positioned directly above one another, separated by a dielectric material. This configuration is common in PCB designs to achieve tight coupling between traces, which is essential for maintaining signal integrity in high-speed circuits.

The inductance of these coupled traces can significantly impact the circuit’s performance, particularly in applications where precise impedance control is necessary.

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Inputs Required

To calculate the inductance, the following inputs are required:

• Trace Width (w): The width of each trace (in meters or inches).
• Trace Separation (s): The distance between the two traces (in meters or inches).
• Trace Length (l): The length of the traces (in meters or inches).
• Trace Thickness (t): The thickness of the traces (in meters or inches).
• Relative Permeability (µr): The relative permeability of the material between the traces.

Outputs Provided

The calculator provides two key outputs:

1. Inductance (L): The total inductance of the coupled traces (in Henries).
2. Inductance per Unit Length (L’): The inductance per unit length of the traces (in Henries per meter or inch).

Formula for

Broadside Coupled Trace Inductance

The inductance of broadside coupled traces can be calculated using the following formula:

Where:

• L is the inductance (Henries).
• μ0​ is the permeability of free space (4π×10^−7 H/m).
• μr​ is the relative permeability of the material.
• l is the length of the traces (meters).
• s is the separation between the traces (meters).
• w is the width of the traces (meters).
• t is the thickness of the traces (meters).

Practical Applications

This calculator is particularly useful for:

• PCB Designers: Ensuring proper impedance matching and signal integrity.
• RF Engineers: Designing circuits where trace inductance affects overall circuit performance.
• High-Speed Circuit Design: Calculating trace inductance to mitigate issues like crosstalk and signal degradation.

The Broadside Coupled Trace Inductance Calculator is an invaluable tool for anyone involved in PCB design and high-frequency circuit design. By providing accurate inductance values based on critical trace parameters, this calculator helps ensure that your designs meet the necessary specifications for optimal performance.

Simply input the trace width, separation, length, thickness, and relative permeability into the calculator, and it will provide you with the total inductance and inductance per unit length, helping you make informed design decisions.