Quadrature calibration methods for sensor applications
AssigneeCypress Semiconductor Corporation
InventorsOleksandr Pirogov, Viktor Kremin, Jens Weber
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Abstract
Apparatuses and methods of quadrature modulation and compensation are described. One touch controller includes a receiver sensing channel to measure a sense signal and generate at least four samples per one period of the sense signal. The touch controller includes quadrature demodulation logic to determine phase information of the sense signal using the at least four samples per one period of the sense signal and processing logic to execute a compensation algorithm to compensate for a phase mismatch of the touch controller based on the phase information.
Claims20
A touch controller comprising:
- one or more receiver sensing channels to measure a sense signal and generate at least four samples per one period of the sense signal;
- quadrature demodulation logic coupled to the one or more receiver sensing channels, the quadrature demodulation logic to generate in-phase and quadrature (IQ) samples using the at least four samples and determine phase information of the sense signal based on the IQ samples;
- and
- processing logic coupled to the quadrature demodulation logic, the processing logic to execute a compensation algorithm to compensate for a phase mismatch of the touch controller based on the phase information.
A method comprising:
- generating a first signal comprising a first phase;
- generating a second signal comprising a second phase;
- measuring a sense signal from at least one sensor;
- generating at least four samples per one period of the sense signal;
- generating in-phase and quadrature (IQ) samples using the at least four samples;
- determining phase and amplitude information of the sense signal based on the IQ samples;
- and
- compensating for a phase and amplitude mismatches between the first signal and the second signal based on the phase and amplitude information.
A system comprising:
- a sensor;
- and
- a processing device coupled to the sensor, wherein the processing device comprises:
- one or more receiver sensing channels to measure a sense signal and generate at least four samples per one period of the sense signal;
- quadrature demodulation logic coupled to the one or more receiver sensing channels, the quadrature demodulation logic to generate in-phase and quadrature (IQ) samples using the at least four samples and determine phase information of the sense signal based on the IQ samples;
- and
- processing logic coupled to the quadrature demodulation logic, the processing logic to execute a compensation algorithm to calibrate at least one phase or amplitude mismatch of the processing device.
Dependencies are inferred from the claim text.