Automatic calibration technique for time of flight (TOF) transceivers
First Claim
1. A method for use in calibrating a system that includesa driver configured to produce a drive signal that can be used to drive a light emitting element with the drive signal to thereby cause a light signal to be emitted,an optical sensor configured to produce a sensor signal that is indicative of a portion of the light signal that reflects from one or more objects and is incident on the optical sensor, andcircuitry configured to produce at least one of a time and phase delay measurement based on a sensor signal produced by the optical sensor, wherein the at least one of the time and phase delay measurement can be used to determine at least one of a distance and presence of one or more objects relative to the optical sensor;
- the method comprising;
(a) during a calibration mode,(a.1) using the driver to produce a drive signal;
(a.2) providing a version of the drive signal to the circuitry configured to produce the at least one of the time and phase delay measurement; and
(a.3) using the circuitry configured to produce the at least one of the time and phase delay measurement to determine the at least one of the time and phase delay introduced by the system; and
(b) during an operational mode, using the at least one of the time and phase delay introduced by the system, as determined during the calibration mode, to calibrate at least one of an actual time and phase delay measurement that is made by the circuitry configured to produce at least one of the time and phase delay measurement.
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Accused Products
Abstract
A system and method for automatically calibrating a Time-of-Flight (TOF) transceiver system for proximity/motion detection, is provided. Moreover, the system comprises a component that senses a signal (e.g., current or voltage) at an light emitting diode (LED), an attenuator, a signal injector at a sensor and a switching circuit that toggles between a normal mode (e.g., when signal from the sensor is input to the sensor front end) and a calibration mode (e.g., when signal from the attenuator is input to the sensor front end). During the calibration mode, the sensor front end identifies the phase delay error within the signal path, including board and/or package parasitic, and accounts for the phase delay error during proximity/motion detection in the normal mode.
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Citations
20 Claims
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1. A method for use in calibrating a system that includes
a driver configured to produce a drive signal that can be used to drive a light emitting element with the drive signal to thereby cause a light signal to be emitted, an optical sensor configured to produce a sensor signal that is indicative of a portion of the light signal that reflects from one or more objects and is incident on the optical sensor, and circuitry configured to produce at least one of a time and phase delay measurement based on a sensor signal produced by the optical sensor, wherein the at least one of the time and phase delay measurement can be used to determine at least one of a distance and presence of one or more objects relative to the optical sensor; -
the method comprising; (a) during a calibration mode, (a.1) using the driver to produce a drive signal; (a.2) providing a version of the drive signal to the circuitry configured to produce the at least one of the time and phase delay measurement; and (a.3) using the circuitry configured to produce the at least one of the time and phase delay measurement to determine the at least one of the time and phase delay introduced by the system; and (b) during an operational mode, using the at least one of the time and phase delay introduced by the system, as determined during the calibration mode, to calibrate at least one of an actual time and phase delay measurement that is made by the circuitry configured to produce at least one of the time and phase delay measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system, comprising:
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a driver configured to produce a drive signal that can be used to drive a light emitting element to thereby cause a light signal to be emitted; an optical sensor configured to produce a sensor signal that is indicative of a portion of the light signal that reflects from one or more objects and is incident on the optical sensor; and circuitry configured to produce at least one of a time and phase delay measurement based on the sensor signal produced by the optical sensor, wherein the at least one of the time and phase delay measurement can be used to determine at least one of a distance and presence of one or more objects relative to the optical sensor; wherein the system can operate in a calibration mode and an operational mode; wherein during the calibration mode, the driver produces a drive signal; the circuitry configured to produce the at least one of the time and phase delay measurement receives a version of the drive signal, and based thereon, determines the at least one of the time and phase delay introduced by the system; and wherein during the operational mode, the circuitry configured to produce the at least one of the time and phase delay measurement uses the at least one of the time and phase delay introduced by the system, as determined during the calibration mode, to calibrate at least one of an actual time and phase delay measurement that is made by the circuitry. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification