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An edge coupled trace inductance calculator is a tool used to calculate the inductance of an edge coupled trace on a printed circuit board (PCB). Inductance is a property of an electrical circuit that describes the amount of energy stored in the magnetic field created by the current flowing through the circuit.

An edge coupled trace on a PCB is a common example of a transmission line. When a current flows through the trace, an electromagnetic wave is created that propagates along the trace. The strength of the electromagnetic wave depends on the geometry of the trace and the dielectric material surrounding the trace.

The inductance of an edge coupled trace on a PCB depends on several factors, including the width and thickness of the trace, the distance between the traces, the dielectric constant of the substrate, and the length of the trace. An edge coupled trace inductance calculator takes these factors into account and provides an estimate of the inductance of the trace.

To use an edge coupled trace inductance calculator, you typically input the width and thickness of the trace, the distance between the traces, the dielectric constant of the substrate, and the length of the trace. The calculator then uses a formula to calculate the inductance of the trace based on these parameters.

One commonly used formula for calculating the inductance of an edge coupled trace on a PCB is:

L = (μ₀ × h) / (4 × π × d × ln(1 + 1.44 × (s / h)))

where L is the inductance in henries, μ₀ is the permeability of free space (4π × 10⁻⁷ H/m), h is the height of the trace above the ground plane, d is the distance between the traces, and s is the width of the trace.

Using an edge coupled trace inductance calculator can be helpful in designing high-speed digital circuits that require transmission lines. By knowing the inductance of an edge coupled trace, you can select the appropriate components and ensure that your circuit will operate as intended.