| 摘要 |
In capacitance measurement circuits and methods that measure capacitances at multiple locations by ramping voltage signals between reference levels, the phase of the voltage signal ramping can be controlled, for example to mitigate currents flowing between measurement locations. Such capacitance measurement circuits and methods can be utilized in touch sensor devices that determine touch position based on capacitance measurements on multiple locations on a touch surface. Controlling the phase of the voltage signal ramps can include concurrently starting the voltage signal ramps, for example by effecting a delay on at least one signal channel that has reached a voltage threshold, or by regulating all the voltage ramps according to a fixed frequency.
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