| 摘要 |
<p>An adaptable DC power consumption circuit (50) is provided with a feedback control loop (78) formed between the power terminal and the control terminal of the RF amplifier (52). A controller (60) influences the feedback control loop to properly set the supply current at the desired minimum level necessary to maintain linear operation of the RF amplifier. The output of the RF amplifier influences the feedback control loop to dynamically vary the supply current from the desired level. Another feedback control loop is formed between the power terminal and a control terminal of a variable voltage supply. The controller influences the feedback control loop to properly set the supply voltage at the desired minimum level necessary to maintain linear operation of the RF amplifier. The output of the RF amplifier influences the feedback control loop to dynamically vary the supply voltage from the desired level. The controller alternately operates the RF amplifier during a high RF output power condition, and bypasses the RF amplifier during a low RF output power condition. In this manner, linear operation of the RF amplifier can be maintained while maximizing the power efficiency of the RF amplifier.</p> |
