Bias-Tees

A bias tee (also known as a DC-to-RF splitter) is a passive RF component with three connectors that separates or combines direct current (DC) and high-frequency (RF) signals.

It enables active RF components such as amplifiers or antennas to be supplied with operating voltage via the same coaxial cable through which the high-frequency signal is transmitted.

Its internal design, comprising a capacitor (which blocks direct current) and an inductor (which blocks HF signals), prevents the sensitive RF measurement equipment from being damaged by the DC voltage.

An ultra high voltage bias tee (UHV bias tee) is a specialised measurement accessory for high-voltage CV measurements on semiconductor components. It combines the high-voltage DC bias with the AC measurement signal from the capacitance measurement unit and routes both signals in a controlled manner to the DUT, without unduly affecting the measurement paths.

Details on the ultra-high-voltage bias tee for CV measurements with the Keysight B1505A can be found in the section Accessories for semiconductor characterisation.