How to Calculate the Inductance of PCB Trace

PCB traces connect components on PCB boards.
••• Jupiterimages/Photos.com/Getty Images

A printed circuit board, or PCB, serves as the operating guts of computers and other electronic equipment. It consists of a network of integrated circuits interconnected by PCB traces. PCB traces are small conductor strips on the PCB that enable current flow to and from integrated circuits. As with standard cable, wires and conductors, PCB traces have measurable impedance, capacitance and inductance levels associated with it. Engineers have to take these values into account in designing PCB-based electrical equipment.

    Find the PCB trace impedance, or "Zo." Refer to the design requirements or schematics of the PCB. As an example, Zo is 20 millohms.

    Find the trace delay, or "DLY," in pico seconds or "ps" per inch. A picosecond is 1 x 10^-12 seconds. DLY is a standard parameter associated with PCBs. Refer to PCB design requirements or schematics. As an example, assume DLY is 12 ps.

    Calculate the PCB trace inductance, or "L," using the formula L = Zo * DLY. Using the example numbers:

    L = 20 x 10^-3 * 12 x 10^-12 = 240 x 10^-15 henries or 0.24 pH, where pH is units of picohenries. Traces on PCBs are small and therefore have small inductance levels.

Related Articles

How to Size a Transformer KVA
How to Find Wattage With Voltage & Frequency
How to Measure the Ohm Value for an Inductor
How to Calculate Electrical Winding Wires by Weight...
How to Read K5M Capacitor Values
How to Calculate Capacitance for AC Coupling
How to Calculate the Inductance of a Ferrite Inductor
How to Read Circuit Boards
How to Calculate CT Ratio
How to Adjust Electrical Amperage
How to Calculate Conductance
How to Calculate 30 KW to Amps
How to Find a Z Score
How to Calculate KVA to MVA
Advantages of a PCB Board
How to Calculate Peak Torque
How to Read Transistor Data
How to Calculate the Field Current in a DC Motor
How to Test Quartz Crystals
Physical Characteristics of Aluminum Oxide