| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain power amplification of small load dependency in the whole amplifier, achieving reduction in power consumption, size and cost. Ž<P>SOLUTION: The power amplifier distributes an input signal to at least three or more amplification paths, amplifies the input signal, and then synthesizes and outputs it. The amplifier has a unit amplifier provided to each amplification path, an input side phase shifting circuit provided each to an input side of the unit amplifier of the amplification path and an output side phase shifting circuit provided each to an output side of the unit amplifier of each amplification path. In a first operation, all the amplifiers work. In a second operation wherein output power is smaller than that in the first operation, at least two or more unit amplifiers amplify and work, and at least one unit amplifier becomes OFF-state. Although passage phase of each amplification path is the same, the output side phase shifting circuit of each amplification path has different passage phase. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
