发明授权
EP1092300B1 CIRCUIT FOR SUPPRESSING A COMMON MODE COMPONENT IN A SIGNAL FROM A CAN COMMUNICATION BUS
有权
电路对GLEICHTAKTKOMPONENT的在CAN-BUS通信信号降低
- 专利标题： CIRCUIT FOR SUPPRESSING A COMMON MODE COMPONENT IN A SIGNAL FROM A CAN COMMUNICATION BUS
- 专利标题（中）： 电路对GLEICHTAKTKOMPONENT的在CAN-BUS通信信号降低
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申请号： EP00926990.3申请日： 2000-04-17
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公开(公告)号： EP1092300B1公开(公告)日： 2008-11-12
- 发明人: BOEZEN, Hendrik , VAN DEN HEUVEL, Abraham, K.
- 申请人： NXP B.V.
- 申请人地址： High Tech Campus 60 5656 AG Eindhoven NL
- 专利权人： NXP B.V.
- 当前专利权人： NXP B.V.
- 当前专利权人地址： High Tech Campus 60 5656 AG Eindhoven NL
- 代理机构： White, Andrew Gordon
- 优先权： EP99201312 19990428
- 国际公布： WO2000067432 20001109
- 主分类号： H04L12/40
- IPC分类号： H04L12/40 ; H04L12/413 ; H03F3/45
摘要：
The common mode component in the difference signal on the bus terminals (2, 4) of a CAN bus is counteracted by four transistors (M1-M4) connected between the supply terminals (28, 32) and a center tap (16) of a voltage divider (6A, 6B, 8, 10, 12A, 12B) between the bus terminals (2, 4). As a result of this, the voltage on the center tap (16) varies to a substantially smaller extent or not at all. Thus, it is possible to use a simpler differential amplifier (20) having a smaller common mode swing at the inputs (22, 24). Moreover, the attenuation factor selected for the voltage divider can be smaller, as a result of which a higher difference voltage is available for the differential amplifier (20).
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