False triggering prevention in a resonant phase sensing system
A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor. The system may also include a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.
1. A system comprising:
a resistive-inductive-capacitive sensor; and
a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to:
at a plurality of periodic intervals, measure phase information associated with the resistive-inductive-capacitive sensor; and
based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor.
2. The system of claim 1 , wherein the measurement circuit is further configured to determine an occurrence of a physical interaction associated with a human-machine interface associated with the mechanical member based on the phase information.
3. The system of claim 2 , further comprising a processing circuit configured to process the phase information and data from at least one other sensor to determine the occurrence of the physical interaction.
4. The system of claim 3 , wherein the at least one other sensor comprises one or more of an accelerometer, a gyroscope, a touch sensor, a proximity sensor, a temperature sensor, and an ambient light sensor.
5. The system of claim 1 , wherein the measurement circuit comprises a coherent incident/quadrature detector to track a resonant frequency of the resistive-inductive-capacitive sensor and the measurement circuit is configured to measure the phase information using the coherent incident/quadrature detector.
6. A method comprising:
at a plurality of periodic intervals, measure phase information associated with a resistive-inductive-capacitive sensor; and
based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor.
7. The method of claim 6 , further comprising determining an occurrence of a physical interaction associated with a human-machine interface associated with the mechanical member based on the phase information.
8. The method of claim 7 , further comprising processing the phase information and data from at least one other sensor to determine the occurrence of the physical interaction.
9. The method of claim 8 , wherein the at least one other sensor comprises one or more of an accelerometer, a gyroscope, a touch sensor, a proximity sensor, a temperature sensor, and an ambient light sensor.
10. The method of claim 6 , further comprising tracking a resonant frequency of the resistive-inductive-capacitive sensor wherein the phase information is measured using a coherent incident/quadrature detector.