The circuit that was used previously is shown below. In the earlier example with our RF power amplifier, a bias tee was used to provide power to the amplifier, while also passing RF output power from the same pin. The simplest type of bias tee is a 2-input device an inductor is used to pass DC power from one input port, and a capacitor is used to pass AC power to the output. What is a Bias Tee?Ī bias tee is a simple circuit that uses an inductor and a capacitor to direct the flow of AC and DC power. These devices are available both as high-power modules for long-range broadcasting, but they can be built as small circuits on a PCB for lower-power RF systems. In this article, I’ll outline how to design this circuit and what the important parameters are for ensuring high-power propagation into your load component. In a previous project with an RF power amplifier layout, there is a bias tee in the design that is used to provide DC power to the amplifier while also allowing RF power to propagate towards the output SMA connector. It is a 2-input, 1-output device that uses reactive elements to provide a power flow along different directions. RF bias tees are used to separate DC and AC power along an interconnect.
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