Groups according to the linkage means 17-20 could amplifier with improved reinforcement, terminal for mobile communication, which the same is used, and method for improving the amplification, which is for this purpose with respect

摘要

The present invention relates to an envelope-tracking amplifier having improved gain, a terminal for mobile communication using the same, and a method for improving gain relating thereto. According to the present invention, an envelope DC current detected from RF signal is inversely applied to a barretter diode for dio frequency in an impedance matching circuit. And therefore, the variable capacitance resulting from ups and downs in a signal level of a power amplifier corrects changing in input or output impedance of the amplifier. As the result, a gain of the amplifier is improved, and a stability of the amplifier is increased.