Abstract: A processing system for an input device includes a transmitter module including transmitter circuitry, a receiver module, and a determination module. The transmitter module is configured to drive the transmitter electrode with a first drive signal to produce a first voltage gradient across the transmitter electrode, wherein the first voltage gradient is non-linear. The receiver module is configured to receive a first resulting signal with a receiver electrode, the resulting signal comprising effects of the first voltage gradient. The determination module is configured to determine positional information for a plurality input objects located simultaneously within a sensing region along the transmitter electrode based on the first resulting signal.

Abstract: A processing system for an input device includes a transmitter module, a receiver module, and a determination module. The transmitter module includes transmitter circuitry and is configured to apply a first differential drive signal across a transmitter electrode to produce a first voltage variation across the transmitter electrode. The receiver module is configured to receive a first resulting signal with a receiver electrode when the first voltage variation is produced across the transmitter electrode. The determination module is configured to determine at least one of a resistance of the transmitter electrode and a resistance of a conductive trace coupled to the transmitter electrode based on the first resulting signal. As a result, an error in the position of an input object can be corrected.

Abstract: A processing system for an input device includes a sensor module and a determination module. The sensor module includes sensor circuitry and is configured to acquire a first plurality of measurements of change in capacitive coupling between each sensor electrode of a first set of sensor electrodes and a second set of sensor electrodes. The sensor module is further configured to acquire a second plurality of measurements of change in capacitive coupling between each sensor electrode of the second set of sensor electrodes and an input object. The determination module is configured to determine a first combined measurement based on the first plurality of measurements, determine a second combined measurement based on the second plurality of measurements, and determine positional information for the input object based on a low ground mass parameter. The low ground mass parameter is based on the first combined measurement and the second combined measurement.

Abstract: A processing system for an input device includes a transmitter module, a receiver module, and a determination module. The transmitter module including transmitter circuitry, and is configured to drive a first end of a transmitter electrode such that the transmitter electrode exhibits a first voltage gradient extending from the first end of the transmitter electrode toward a second end of the transmitter electrode, wherein the first voltage gradient comprises a set of substantially discrete voltage values. The receiver module includes receiver circuitry, the receiver module configured to receive a first resulting signal with a first receiver electrode while the transmitter module is driving the first end of the transmitter electrode.

Abstract: A processing system includes a transmitter module, a receiver module, and a determination module. The transmitter module is configured to transmit in accordance with a first excitation mode with a transmitter electrode during a first interval and a third interval of a sensing frame period, wherein, during the first excitation mode, a first voltage variation is generated in the transmitter electrode. The transmitter module is further configured to transmit in accordance with a second excitation mode with the transmitter electrode during a second interval of the sensing frame, wherein, during the second excitation mode, a second voltage variation different from the first voltage variation is generated in the transmitter electrode.

Abstract: Methods for determining the position of multiple objects concurrently disposed within a capacitive sensing region are described. In one embodiment, indicia are received from a first plurality of capacitive sensor electrodes oriented along a first axis. Indicia are received from a second plurality of capacitive sensor electrodes oriented along a second axis, wherein the second axis is oriented non-parallel to the first axis. Indicia are received from a third plurality of capacitive sensor electrodes oriented along a third axis, wherein the third axis is oriented non-parallel to the first axis and the second axis. Then, the indicia received from the first plurality of capacitive sensor electrodes, the indicia received from the second plurality of capacitive sensor electrodes, and the indicia received from the third plurality of capacitive sensor electrodes is used to determine the positions of the multiple objects concurrently disposed within the capacitive sensing region.