公开(公告)号：US5548246A

公开(公告)日：1996-08-20

申请号：US438472

申请日：1995-05-10

申请人： Kazuya Yamamoto ,  Noriyuki Tanino ,  Tetsuya Umemoto

发明人： Kazuya Yamamoto ,  Noriyuki Tanino ,  Tetsuya Umemoto

IPC分类号： H03F3/68 ,  H03F1/02 ,  H03F3/21 ,  H03F3/24 ,  H04B1/16 ,  H03F1/14 ,  H03F3/16 ,  H03F3/191

CPC分类号： H03F3/211 ,  H03F1/0277 ,  H03F1/56

摘要： A power amplifier comprises opposite input and output terminals, a first amplifier circuit connected between the input terminal and the output terminal and comprising a first amplifier FET and a first matching circuit, and a second amplifier circuit connected between the input terminal and the output terminal and comprising a second amplifier FET, a second matching circuit, and a switching circuit. In this power amplifier, the first amplifier circuit outputs an output signal of a first power level when the first amplifier FET is operated while the second amplifier FET is not operated and the switching circuit is turned off, and the second amplifier circuit outputs an output signal of a second power level when the first amplifier FET is not operated while the second amplifier FET is operated and the switching circuit is turned on. Therefore, impedances of the output side matching circuits of the first and second amplifier circuits which output amplified signals of different power levels can be optimized with high precision. As the result, in both the high-power output operation and the low-power output operation, the efficiencies of the first and second amplifier circuits are significantly improved.

摘要翻译： 功率放大器包括相对的输入和输出端子，连接在输入端子和输出端子之间并包括第一放大器FET和第一匹配电路的第一放大器电路，以及连接在输入端子和输出端子之间的第二放大器电路，以及 包括第二放大器FET，第二匹配电路和开关电路。 在该功率放大器中，当第一放大器FET工作而第二放大器FET不工作且开关电路断开时，第一放大器电路输出第一功率电平的输出信号，第二放大电路输出输出信号 当第二放大器FET工作时第一放大器FET不工作并且开关电路导通时，具有第二功率电平。 因此，可以高精度地优化输出不同功率电平的放大信号的第一和第二放大器电路的输出侧匹配电路的阻抗。 结果，在大功率输出操作和低功率输出操作中，第一和第二放大器电路的效率显着提高。