| 发明名称 |
Baseline charge compensation |
| 摘要 |
A compensation circuit may include a current source configured to control an amplitude of a current pulse, a memory configured to store a plurality of duration values each corresponding to a set of one or more sensor electrodes of a plurality of sensor electrodes, and a pulse width controller configured to control a duration of the current pulse based on a first duration value of the plurality of duration values, and to apply the current pulse to a compensation node of a capacitance sensor during a measurement cycle for a first set of one or more sensor electrodes, where the first set of one or more sensor electrodes corresponds to the first duration value. |
| 申请公布号 |
US9019220(B1) |
申请公布日期 |
2015.04.28 |
| 申请号 |
US201213612696 |
申请日期 |
2012.09.12 |
| 申请人 |
Cypress Semiconductor Corporation |
发明人 |
Klein Hans W.;Walsh Paul;O'Donoghue Keith;Ogirko Roman |
| 分类号 |
G06F3/041;G06F3/044 |
主分类号 |
G06F3/041 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A compensation circuit, comprising:
a current source configured to control an amplitude of a current pulse; a memory configured to store a plurality of duration values each corresponding to a set of one or more sensor electrodes of a plurality of sensor electrodes; and a pulse width controller configured to control a duration of the current pulse based on a first duration value of the plurality of duration values, and to add the current pulse to a measurement current generated by a measurement cycle of a first set of one or more sensor electrodes by applying the current pulse to a compensation node of a capacitance sensor during the measurement cycle for the first set of one or more sensor electrodes, wherein the first set of one or more sensor electrodes corresponds to the first duration value. |
| 地址 |
San Jose CA US |
