发明名称 |
Power amplifier device. |
摘要 |
<p>For supply to first and second feedforward distortion compensating circuits 33(1), 33(2) connected in parallel, a two-divider 31 divides into signals of a common phase and a common amplitude an input radio frequency signal supplied to an input terminal 11. A two-combiner 35 combines component outputs of the feedforward circuits in inphase as an amplified output signal which is supplied to an output terminal 13. In general, N feedforward circuits (N being an integer not less than two) are connected in parallel and are supplied with the input radio frequency signal through an N-divider. Component outputs of the feedforward circuits are combined in inphase as the output signal by an N-combiner. Alternatively, the input radio frequency signal is divided into signals of a predetermined phase difference and of a common amplitude by the N-divider. In this case, the component outputs of the feedforward circuits are combined in a phase of cancelling the predetermined phase difference by the N-combiner. <IMAGE></p> |
申请公布号 |
EP0552059(A1) |
申请公布日期 |
1993.07.21 |
申请号 |
EP19930300273 |
申请日期 |
1993.01.15 |
申请人 |
JAPAN RADIO CO., LTD;NIPPON TELEGRAPH AND TELEPHONE CORPORATION;NTT MOBILE COMMUNICATIONS NETWORK INC. |
发明人 |
SAKAMOTO, HIRONORI C/O JAPAN RADIO CO., LTD.;ITO, AKIRA;NOJIMA, TOSHIO |
分类号 |
H03F3/68;H03F1/32;H03F3/60 |
主分类号 |
H03F3/68 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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