For the drain terminal, "bias voltage" should perhaps be substituted with the words "supply voltage " or just "voltage". cannot be responsible for the device quiescent current, and cannot be called a "bias" terminal. If we set zero current through the main current path, varying the voltage on the drain, or plate etc, will not change that current, unless you send it into breakdown, which would be a dumb idea. As we all know setting the quiescent current in an amplifying device (Idq for a FET) is set by the normal, no-signal, voltage (or current) of the control element ( grid, gate, base etc). I think the (miss)use of the word "bias" has been started by non-native English speakers, who has no conception of the English word "bias". Gates are "biased", as are grids and bases, but plates, collectors and drains are supplied with voltage. Below an email from Chris is paraphrased: We've been guilty of this ourselves but will work to clean up our act. Let's start this page off with some information on how the phase "drain bias" is often misused. Welcome to the best web page on microwave FETs! This tutorial will provide an "outstanding understanding" of FETs as they are applied in microwave engineering all of this information is directly applicable to understanding monolithic microwave integrated circuits (MMICs).
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