发明授权
- 专利标题: AM signal transmitter
- 专利标题(中): AM信号发射机
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申请号: US816195申请日: 1986-01-06
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公开(公告)号: US4723308A公开(公告)日: 1988-02-02
- 发明人: Naoki Kobayashi , Takashi Asakura , Hideo Sato
- 申请人: Naoki Kobayashi , Takashi Asakura , Hideo Sato
- 申请人地址: JPX
- 专利权人: NEC Corporation
- 当前专利权人: NEC Corporation
- 当前专利权人地址: JPX
- 优先权: JPX60-1956 19850109
- 主分类号: H03C1/00
- IPC分类号: H03C1/00 ; H03C1/18 ; H03F3/24 ; H04B1/04
摘要:
An AM signal transmitter for generating an amplitude modulated carrier comprises a voltage-increasing stage and a power-increasing stage. The voltage-increasing stage includes a pulse width modulator, responsive to an input modulation signal, for producing a pair of high frequency pulse trains which are modulated in width in a complementary fashion. The pair of pulse trains are respectfully fed to a pair of switching and amplifying elements arranged in push-pull fashion. The output of the switching and amplifying elements is processed through a low pass filter to eliminate high frequency components, and is stepped up in voltage by processing through a voltage step-up transformer. The output of the voltage step-up transformer is then fed to the power stage of the AM signal transmitter, which include a power amplifier. Both the power amplifier and the switching and amplifying elements can be powered from a single power source. Other embodiments of the invention can be realized.
公开/授权文献
- US5869893A Semiconductor device having a trapezoidal joint chip 公开/授权日:1999-02-09
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