公开(公告)号：US09134349B2

公开(公告)日：2015-09-15

申请号：US13711571

申请日：2012-12-11

申请人： BCD Semiconductor Manufacturing Limited

发明人： Jinxi Hu ,  Jiabin Wang ,  Xujiang Huang

IPC分类号： G01R15/20 ,  G01R33/07 ,  H03F3/387 ,  H03F3/45

CPC分类号： G01R15/202 ,  G01R33/07 ,  H03F3/387 ,  H03F3/45475 ,  H03F3/45995 ,  H03F2200/261 ,  H03F2203/45138 ,  H03F2203/45528 ,  H03F2203/45538 ,  H03F2203/45551 ,  H03F2203/45588 ,  H03F2203/45624 ,  H03F2203/45634 ,  H03F2203/45681

摘要： A chopper amplifier circuit for sensing Hall voltage with reduced offsets includes a Hall sampling circuit with a first switching circuit for selectively coupling each of four nodes of a Hall plate to either a power source or a ground terminal. The circuit also includes a differential amplifier and a second switching circuit configured for selectively coupling each of the four nodes to inputs of the differential amplifier. A Hall voltage signal retaining circuit includes two groups of four storage devices and a second group of four storage devices. A third switching circuit is configured for outputs of the differential amplifier to selected ones of the storage devices. A fourth switching circuit is configured for selectively coupling the storage devices outputs of the chopper amplifier circuit.

摘要翻译： 用于以减小的偏移量感测霍尔电压的斩波放大器电路包括具有第一开关电路的霍尔采样电路，用于选择性地将霍尔板的四个节点中的每一个耦合到电源或接地端子。 电路还包括差分放大器和配置用于选择性地将四个节点中的每一个耦合到差分放大器的输入的第二开关电路。 霍尔电压信号保持电路包括两组四个存储装置和第二组四个存储装置。 第三开关电路被配置用于将差分放大器的输出与所选存储器件的输出相配合。 第四开关电路被配置为选择性地耦合斩波放大器电路的存储设备输出。