How do I apply a dc bias to RF inputs of the ADG9xx switches?
Adding a small DC bias to the RF inputs will increase the power handling ability of the ADG9xx switches. A 0.5V dc will increase the power handling to 16dBm. To minimize any current drain through the termination resistance on the input side, it is best to add the bias on the output (RFC) side. This is the best practice, especially for low-power portable applications. It may be necessary to apply dc-blocking capacitors on the RF outputs if downstream circuitry cannot tolerate a dc bias.
Example biasing circuit.
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