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1. 发明授权

US09612686B2 Capacitance sensor with noise rejection 有权
公开(公告)号：US09612686B2
公开(公告)日：2017-04-04
申请号：US14946784
申请日：2015-11-20
申请人： FREESCALE SEMICONDUCTOR, INC.
发明人： Liang Qiu , Bin Feng , Xiaolei Wu
IPC分类号： G06F3/045 , G06F3/041 , G06F3/044 , H03K17/96 , G05F3/26
CPC分类号： G06F3/0418 , G05F3/262 , G06F3/044 , H03K17/962 , H03K2217/960705 , H03K2217/960725
摘要： In a touch interface, a sensor provides an output signal that is a function of a sensed capacitance. The sensor includes a charger for repetitively applying first and second voltages to charge the sensed capacitance to first and second charge values in first and second phases respectively. A sampler includes a first current mirror for providing first and second sample current signals that are a function of the first and second charge values respectively. An accumulator uses an accumulator signal to provide the output signal. The accumulator repetitively uses the first and second sample current signals differentially to modify a charge on an accumulator capacitor and provide the accumulator signal. The accumulator signal is a progressive function of the sensed capacitance but cancels noise in the first and second sample signals at frequencies less than a repetition rate of operation of the accumulator.

2. 发明申请

US20160364079A1 CAPACITANCE SENSOR WITH NOISE REJECTION 有权
标题翻译：具有噪声抑制的电容传感器
公开(公告)号：US20160364079A1
公开(公告)日：2016-12-15
申请号：US14946784
申请日：2015-11-20
申请人： FREESCALE SEMICONDUCTOR, INC.
发明人： Liang Qiu , Bin Feng , Xiaolei Wu
IPC分类号： G06F3/041 , G06F3/044
CPC分类号： G06F3/0418 , G05F3/262 , G06F3/044 , H03K17/962 , H03K2217/960705 , H03K2217/960725
摘要： In a touch interface, a sensor provides an output signal that is a function of a sensed capacitance. The sensor includes a charger for repetitively applying first and second voltages to charge the sensed capacitance to first and second charge values in first and second phases respectively. A sampler includes a first current mirror for providing first and second sample current signals that are a function of the first and second charge values respectively. An accumulator uses an accumulator signal to provide the output signal. The accumulator repetitively uses the first and second sample current signals differentially to modify a charge on an accumulator capacitor and provide the accumulator signal. The accumulator signal is a progressive function of the sensed capacitance but cancels noise in the first and second sample signals at frequencies less than a repetition rate of operation of the accumulator.
摘要翻译：在触摸界面中，传感器提供作为感测电容的函数的输出信号。该传感器包括用于重复地施加第一和第二电压的充电器，用于将所感测的电容分别充电到第一和第二相中的第一和第二充电值。采样器包括用于分别提供作为第一和第二充电值的函数的第一和第二采样电流信号的第一电流镜。累加器使用累加器信号来提供输出信号。蓄电池重复地使用第一和第二采样电流信号差分地修改蓄电池电容器上的电荷并提供累加器信号。累加器信号是感测电容的渐进功能，但是以小于累加器的重复操作频率的频率消除第一和第二采样信号中的噪声。

3. 发明授权

US09983725B2 Mutual capacitance sensing circuit with increased sensitivity 有权
公开(公告)号：US09983725B2
公开(公告)日：2018-05-29
申请号：US15253906
申请日：2016-09-01
申请人： FREESCALE SEMICONDUCTOR, INC.
发明人： Xiaolei Wu , Liang Qiu
IPC分类号： G06F3/041 , G06F3/044
CPC分类号： G06F3/0416 , G06F3/044
摘要： An electronic device includes mutual capacitance sensing circuitry for a capacitive touch pad. The touch pad has pairs of transmit and receive electrodes. The sensing circuitry intermittently charges and discharges the transmit electrode, and then measures corresponding voltage level changes at the receive electrode. A non-linear voltage-to-current converter is used to detect the voltage level changes, which allows for great sensitivity to mutual capacitance changes.

4. 发明授权

US09715321B2 Capacitance sensor with noise rejection 有权
公开(公告)号：US09715321B2
公开(公告)日：2017-07-25
申请号：US14946750
申请日：2015-11-19
申请人： FREESCALE SEMICONDUCTOR, INC.
发明人： Xiaolei Wu , Liang Qiu
IPC分类号： G06F3/045 , G06F3/044 , G06F3/041 , H03K17/96
CPC分类号： G06F3/044 , G06F3/0418 , H03K17/962 , H03K2217/960705 , H03K2217/960725 , H03K2217/96074
摘要： A sensor for providing an output signal that is a function of a sensed capacitance, in a touch interface for example. The sensor includes a charger for repetitively applying first and second voltages to charge the sensed capacitance to first and second charge values in first and second phases respectively. A sampler provides first and second sample signals that are a function of the first and second charge values respectively. An accumulator uses an accumulator signal to provide the output signal. The accumulator repetitively uses the first sample signal incrementally and the second sample signal decrementally in providing the accumulator signal. The accumulator signal is a progressive function of the sensed capacitance but tends to cancel a noise in the first and second sample signals at frequencies less than a repetition rate of operation of the accumulator.

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