Charge distribution
AssigneeSynaptics Incorporated
InventorsMarshall J Bell, Jeffrey Small
Life of this patent
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Abstract
A processing system for an input device includes a receiver module and a charge distributor. The receiver module includes a first charge integrator coupled to a first sensor electrode and configured to integrate a charge on the first sensor electrode. The charge distributor includes a current conveyor and a plurality of output stages coupled to the current conveyor, wherein a first output stage of the plurality of output stages comprises a plurality of current mirrors and is configured to output a first scaled mirrored charge to offset the charge integrated by the first charge integrator, wherein the first scaled mirrored charge is based on a charge signal provided via the current conveyor.
Claims20
A processing system for an input device comprising:
- a receiver module comprising a first charge integrator coupled to a first sensor electrode and configured to integrate a charge on said first sensor electrode;
- and
- a charge distributor comprising:
- a current conveyor;
- and
- a plurality of output stages coupled to the current conveyor, wherein a first output stage of the plurality of output stages comprises a plurality of current mirrors and is configured to output a first scaled mirrored charge to offset said charge integrated by said first charge integrator, wherein said first scaled mirrored charge is based on a charge signal provided via said current conveyor.
An input device comprising:
- a plurality of sensor electrodes;
- and
- a processing system coupled to said plurality of sensor electrode and configured to:
- receive a resulting signal with a first sensor electrode of said plurality of sensor electrodes, wherein said resulting signal corresponds to a charge on said first sensor electrode offset by an output charge supplied by an output stage of a charge distributor comprising a current conveyor;
- and
- determine position of an input object with respect to a sensing region of said input device based on said resulting signal.
A method for charge offsetting, said method comprising:
- integrating charge on a first sensor electrode with a charge integrator;
- and
- supplying an output charge from a first output stage of a charge distributor to offset said charge on said first sensor electrode, wherein said first output stage is coupled to a current conveyor and comprises a plurality of current mirrors, the plurality of current mirrors are configured to scale and mirror a charge signal received from said current conveyor to generate said output charge.
Dependencies are inferred from the claim text.