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US 11,531,425 B1Granted
Inter-band harmonics interference mitigation for multi-frequency-region parallel scan
AssigneeSynaptics Incorporated
InventorGuozhong Shen
Life of this patent
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Abstract
A method for operating an input device, the method involving obtaining a number of non-sinusoidal transmitter signals with unique base frequencies, and selecting a sampling frequency of an analog-to-digital converter (ADC) such that a number of aliasing artifacts associated with higher harmonics of the non-sinusoidal transmitter signals is located at frequencies different from the base frequencies.
Claims20
A method for operating an input device, the method comprising:
- obtaining a plurality of non-sinusoidal transmitter signals with unique base frequencies;
- and
- selecting a sampling frequency of an analog-to-digital converter (ADC) such that:
- a plurality of aliasing artifacts associated with higher harmonics of the non-sinusoidal transmitter signals are located at frequencies different from the base frequencies.
1 more element
An input device, comprising:
- a plurality of transmitter electrodes disposed in a sensing region of the input device;
- a receiver electrode in the sensing region;
- and
- a processing system comprising:
- an analog-to-digital converter (ADC) operating at a sampling frequency,
- wherein the processing system is configured to:
- simultaneously drive at least a subset of the plurality of transmitter electrodes using a plurality of non-sinusoidal transmitter signals with unique base frequencies;
- receive, on the receiver electrode, a resulting signal;
- and
- analog-to-digital convert the resulting signal, causing a plurality of aliasing artifacts associated with higher harmonics of the plurality of non-sinusoidal transmitter signals,
- wherein the sampling frequency of the ADC is selected to locate the plurality of aliasing artifacts at frequencies different from the base frequencies.
8 more elements
A processing system for an input device,
- the processing system comprising:
- an analog-to-digital converter (ADC) operating at a sampling frequency,
- wherein the processing system is configured to:
- simultaneously drive at least a subset of a plurality of transmitter electrodes using a plurality of non-sinusoidal transmitter signals with unique base frequencies,
- wherein the plurality of transmitter electrodes is disposed in a sensing region of the input device;
- receive, on a receiver electrode, a resulting signal;
- and
- analog-to-digital convert the resulting signal, causing a plurality of aliasing artifacts associated with higher harmonics of the plurality of non-sinusoidal transmitter signals,
- wherein the sampling frequency of the ADC is selected to locate the plurality of aliasing artifacts at frequencies different from the base frequencies.
6 more elements
Dependencies are inferred from the claim text.