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US08096179B2 Sensor device with reduced parasitic-induced error 有权
具有减少的寄生诱导误差的传感器装置

Sensor device with reduced parasitic-induced error
Abstract:
A device (110) includes a sensing element (26) having drive nodes (34, 36) and sense nodes (42, 44). Parasitic capacitance (22) is present between drive node (34) and sense node (42). Likewise, parasitic capacitance (24) is present between drive node (36) and sense node (44). When a drive signal (56) is applied between drive nodes (34, 36), a parasitic current (70) between drive and sense nodes (34, 42) and a parasitic current (72) between drive and sense nodes (36,44) is created due to the parasitic capacitances (22, 24). A capacitive network (112) is coupled between the drive node (36) and the sense node (42) to create a correction current (134) through capacitive network (112) that cancels parasitic current (70). Likewise, a capacitive network (114) is coupled between the drive node (34) and the sense node (44) to create a correction current (138) through capacitive network (112) that cancels parasitic current (72).
Abstract(Chinese):

设备（110）包括具有驱动节点（34,36）和感测节点（42,44）的感测元件（26）。 寄生电容（22）存在于驱动节点（34）和感测节点（42）之间。 类似地，寄生电容（24）存在于驱动节点（36）和感测节点（44）之间。 当驱动信号（56）施加在驱动节点（34,36）之间时，驱动和感测节点（34,42）之间的寄生电流（70）和驱动和感测节点（36,44）之间的寄生电流（72） ）由于寄生电容（22,24）而产生。 电容网络（112）耦合在驱动节点（36）和感测节点（42）之间，以通过消除寄生电流（70）的电容网络（112）产生校正电流（134）。 类似地，电容网络（114）耦合在驱动节点（34）和感测节点（44）之间，以通过消除寄生电流（72）的电容网络（112）产生校正电流（138）。

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