| 摘要 |
An amplifying circuit which can provide an output signal having less distortion at high power efficiency without increasing the circuit scale and the sizes of the entire device. The amplifying circuit ( 100 ) generates two constant envelope signals from an OFDM signal inputted to an S/P converting section ( 131 ), and after amplifying each of the constant envelope signals by two amplifiers ( 111, 112 ), respectively, the signals are combined by a combiner ( 113 ) and a transmission signal is provided. At this time, a pilot signal generating section ( 102 ) adds a pilot signal whose frequency orthogonally intersects with that of an OFDM subcarrier to the two constant envelope signals, extracts a pilot signal from the transmission signal of output, and controls a vector adjusting section ( 105 ) so that the gains or the phases of the two systems are equivalent.
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