发明授权
- 专利标题: Output overvoltage protection circuit for power amplifier
- 专利标题(中): 功率放大器输出过压保护电路
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申请号: US10889059申请日: 2004-07-13
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公开(公告)号: US07145397B2公开(公告)日: 2006-12-05
- 发明人: Kazuya Yamamoto , Teruyuki Shimura , Tomoyuki Asada , Satoshi Suzuki
- 申请人: Kazuya Yamamoto , Teruyuki Shimura , Tomoyuki Asada , Satoshi Suzuki
- 申请人地址: JP Tokyo
- 专利权人: Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人: Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人地址: JP Tokyo
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权: JP2003-289815 20030808
- 主分类号: H03F1/52
- IPC分类号: H03F1/52
摘要:
Disclosed is an output overvoltage protection circuit for a power amplifier having a plurality of stages, which comprises a monitor circuit for monitoring an output overvoltage of an output transistor in the final stage of the power amplifier and allowing a current to flow therethrough in response to the monitored output overvoltage, and a current mirror circuit for supplying a current proportional to the current from the monitor circuit in such a manner that the base bias of the first-stage transistor of the power amplifier is reduced in response to the current supplied from the current mirror circuit, to reduce the output of the final-stage output transistor.