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POWER AMPLIFYING MODULE CAPABLE OF IMPROVING OUTPUT POWER OF A POWER AMPLIFIER BY REDUCING DEVIATION OF SENSED CURRENT
POWER AMPLIFYING MODULE CAPABLE OF IMPROVING OUTPUT POWER OF A POWER AMPLIFIER BY REDUCING DEVIATION OF SENSED CURRENT
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机译:通过减小感测电流的偏差来改善功率放大器的输出功率的功率放大模块
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摘要
PURPOSE: A power amplifying module is provided to control bias of a power amplifier as desired by inserting a sensor PMOS into a Power PMOS of an LDO(Low Dropout). ;CONSTITUTION: A main LDO(10) conducts only output current between an input node and an output node according to a level of controlled output voltage. The main LDO compares lamp voltage with feedback voltage. An LDO control circuit(12) generates a linear control signal having a voltage level in proportion with difference between the lamp voltage and the feedback voltage. A power PMOS(14) is connected between the input node and output node. The power PMOS is controlled by the output signal of the LDO control circuit. A current sensor(20) comprises a sensor PMOS(24), a switch(26) and a current detecting circuit(22) in order to sense the current of the main LDO.;COPYRIGHT KIPO 2011
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