Kelvin Bias Tee vs. Regular Bias Tee

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AN-014 | July29, 2025

A bias tee is a three-port device that is commonplace in the test and measurement world. Its application includes scenarios which need DC bias, voltage or current, injected onto the RF transmission line to bias components such as photo diodes, active antennas, and amplifiers. 

A Kelvin bias tee is a four-port device that adds a sense port to the standard bias tee. This special variation enables the user to precisely measure the DC voltage at the DUT, thus eliminating biasing errors.

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