发明名称 |
INCREASING THE DYNAMIC RANGE OF AN INTEGRATOR BASED MUTUAL-CAPACITANCE MEASUREMENT CIRCUIT |
摘要 |
In one embodiment, a method includes deactivating an integrator of a mutual-capacitive measurement circuit and configuring the mutual-capacitive measurement circuit according to a first voltage configuration. The first voltage configuration results in a charge on a sensor capacitor and a compensation capacitor when a supply voltage is applied to the mutual-capacitive measurement circuit. The method also includes adjusting a variable reference voltage input of the integrator to a first reference voltage, wherein the first reference voltage is selected to increase an output range of the mutual-capacitive measurement circuit. The method also includes applying the supply voltage to the mutual-capacitive measurement circuit and obtaining a first reference measurement from an analog-digital-converter coupled to an output of the mutual-capacitance measurement circuit. |
申请公布号 |
US2014085252(A1) |
申请公布日期 |
2014.03.27 |
申请号 |
US201213627028 |
申请日期 |
2012.09.26 |
申请人 |
HANSSEN INGAR;WHELAN RIAN |
发明人 |
HANSSEN INGAR;WHELAN RIAN |
分类号 |
G01R27/26;G06F3/044 |
主分类号 |
G01R27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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