| 摘要 |
Power gain and quiescent current of a radio frequency (RF) transistor is controlled by a current draw-away circuit(102) that diverts ("draws away") a portion of the reference current from a reference transistor residing in an RF transistor bias circuit. When in the "off" state, the current draw-away circuit(102) is conducting and draws a draw-away current, IDRAW, through a resistor. The magnitude of IDRAW is determined by the resistor. Other embodiments include a variable resistance that varies IDRAW, a variable current source (or variable voltage source) that varies IDRAW, by adjusting the current (or voltage) applied to the control input of the transistor residing in the current draw-away circuit(102), and two or more current draw-away circuits individually controlled such that one or any combination of the current draw-away circuits varies IDRAW.
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