Patent ID: 6781455
Filing Date: 2004-08-24
Classification: H03F

Abstract:
A high efficiency power amplifier comprising:an input matching unit for matching a predetermined input signal to a next terminal; a first amplifying means for amplifying the signal outputted from the input matching unit; a second amplifying means, which is electrically connected in parallel to the first amplifying means, for amplifying the signal outputted from the input matching unit; an output matching unit for performing an impedance matching of the amplified signal from the first and second amplifying means and outputting the matched signal through an output terminal; a first power control path for electrically connecting between the input matching unit and the output matching unit and including the first amplifying means therebetween; a second power control path for electrically connecting between the input matching unit and the output matching unit and including the second amplifying means therebetween; a bypass path for electrically connecting between the input matching unit and the output matching unit; a control circuit unit for selectively outputting predetermined path control signals to the first and second amplifying means on the basis of an antennal output signal outputted and applied from a predetermined control module whereby the first and second power control paths or a bypass path are selected, wherein the first amplifying means comprises: a first amplifier for amplifying the signal outputted from the input matching unit; an intermediate part matching unit for receiving the signal outputted from the first amplifier and performing an impedance matching; and a second amplifier for amplifying and outputting the output signal from the intermediate part matching unit; and the second amplifying means comprises: a third amplifier for amplifying the signal outputted from the input matching unit; an intermediate part matching unit for receiving the signal outputted from the third amplifier and performing an impedance matching; and a fourth amplifier for amplifying and outputting the output signal from the intermediate part matching unit.