发明授权
- 专利标题： QPSK power amplifier distortion correction system
- 专利标题（中）： QPSK功率放大器失真校正系统
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申请号： US682235申请日： 1991-04-09
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公开(公告)号： US5247542A公开(公告)日： 1993-09-21
- 发明人: Tetsuo Onodera , Eiichi Nakanishi
- 申请人： Tetsuo Onodera , Eiichi Nakanishi
- 申请人地址： JPX Tokyo
- 专利权人： Oki Electric Industry Co., Ltd.
- 当前专利权人： Oki Electric Industry Co., Ltd.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX2-105401 19900423
- 主分类号： H03F1/32
- IPC分类号： H03F1/32 ; H03G3/20 ; H04B1/04 ; H04L27/20
摘要：
A quadrature phase-shift keying modulator produces a QPSK signal which is amplified by a power amplifier. The amplitude gain of the power amplifier is controlled in response to an amplitude difference between the QPSK signal output by the modulator and the amplified QPSK signal output by the power amplifier. A phase detector, connected in series between the modulator and the power amplifier, eliminates amplitude variations from the QPSK signal prior to amplification. A voltage-controlled phase shifter, connected in series between the phase detector and the power amplifier, shifts the QPSK signal in phase by an amount responsive to amplitude information in the QPSK signal.
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