发明授权
- 专利标题: Automatic de-emphasis setting for driving capacitive backplane
- 专利标题(中): 用于驱动电容背板的自动去加重设置
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申请号: US12725534申请日: 2010-03-17
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公开(公告)号: US08125241B2公开(公告)日: 2012-02-28
- 发明人: Roger Fratti , Dwight Daugherty
- 申请人: Roger Fratti , Dwight Daugherty
- 申请人地址: US CA Milpitas
- 专利权人: LSI Corporation
- 当前专利权人: LSI Corporation
- 当前专利权人地址: US CA Milpitas
- 主分类号: H03K17/16
- IPC分类号: H03K17/16 ; H03K19/003 ; H03K5/12
摘要:
In described embodiments, automatic de-emphasis setting is provided for driving a capacitive backplane. Line impedance and line length of a transmission (TX) device are measured that form a load impedance of a driver. For some exemplary embodiments, the line impedance is predominantly a line capacitance, and such embodiments detect this capacitance. Measured line impedance is converted to a control signal (such as, for example, a three bit digital control signal) which automatically sets the de-emphasis of the TX stage. With the amount of capacitance and the length of the transmission line, the appropriate de-emphasis settings might be determined, and such de-emphasis setting be applied by the transmitter to the driver to compensate for transmission line effects.