Insertion Loss Analysis For Xmultiple Connectors and Components


From Xmultiple Engineering Dept.

Insertion Loss

In the electronic field, insertion loss is the loss of signal power resulting from the insertion of a device in a transmission line. This can also be an optical fiber cable. Insertion Loss is expressed as a ratio in dB relative to the transmitted signal power. Insertion Loss can alos be referred to as attenuation. To calculate insertion loss, If the power transmitted by the source is PT and the power received by the load is PR, then the insertion loss in dB is given by:

In metallic conductor systems, radiation losses, resistive losses in the conductor as well as losses in the surrounding dielectric all reduce the power. Line terminations play an important part in insertion loss because they reflect some of the power. All of these effects can be conceptually modelled as various elements which make up the equivalent circuit of the line In an optical fiber system, insertion loss is introduced by things such as connectors, splices, and couplers.

For our analysis related to connectors, insertion loss is typically the effect on a signal as it runs from a PCB into a connector. Insertion loss is often due to a difference of impedance, or impedance mismatch, from PCB to connector.

Testing for inserstion loss can be made by analyzing a signal as it passes through a connector system. Most designers target a -3 dB insertion loss as the critical value of connector performance.

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