RIC Sensor Resonance Detection and Transfer Function Mapping
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Solution Overview
Problem
Resistive-inductive-capacitive sensors in mobile devices face challenges with manufacturing variances, temperature drift, component aging, and electromagnetic interference, which affect their sensitivity, power consumption, and size, necessitating accurate calibration and noise reduction for precise measurement.
Innovation Solution
A system comprising a resistive-inductive-capacitive sensor, a driver, and a measurement circuit that measures phase and amplitude information during a calibration phase to determine the resonant frequency and transfer function, enabling effective calibration and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional force or pressure sensors are used to detect user interaction, then sensor sensitivity can be maintained, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical force or pressure sensors with a resistive-inductive-capacitive (RIC) sensor that uses electrical measurements. The RIC sensor detects user interaction by measuring changes in resistance, inductance, or capacitance caused by mechanical displacement, thereby substituting a mechanical sensing system with an electrical one that achieves comparable sensitivity while reducing device complexity
Solution Approach 2:
The patent utilizes changes in electrical parameters (resistance, inductance, capacitance) of the RIC sensor in response to mechanical displacement. By measuring these parameter changes rather than direct mechanical force, the system achieves sensitive detection with simpler device architecture, as electrical parameter measurements can be performed with standard integrated circuit components
2Device complexity
If resistive-inductive-capacitive sensors are used to reduce device complexity, then manufacturing precision and measurement accuracy deteriorate due to variances and environmental factors
Solution Approach 1:
The patent performs preliminary characterization of the RIC sensor during manufacturing to determine its specific electrical characteristics (resistance, inductance, capacitance values and their relationships). This preliminary action creates a reference model that is stored and used during operation to compensate for manufacturing variances and environmental effects, thereby maintaining measurement accuracy despite using simpler RIC sensor hardware
Solution Approach 2:
The patent implements feedback by continuously monitoring the electrical parameters of the RIC sensor and comparing them against the reference model obtained during preliminary characterization. When deviations occur due to temperature drift, aging, or manufacturing variances, the system uses this feedback information to adjust measurements and maintain accuracy, effectively compensating for the simpler sensor design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and sensitivity of resistive-inductive-capacitive sensors by accounting for manufacturing variances and environmental factors, improving their performance and reliability in mobile devices.
Implementation Method 1
a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor with a driving signal at a driving frequency
Implementation Method 2
based on the phase and amplitude information, determine at least one of a resonant frequency of the resistive-inductive-capacitive sensor and a transfer function of the resistive-inductive-capacitive sensor
Data Source
AI summary
A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor with a driving signal at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to, during a calibration phase of the measurement circuit, measure phase and amplitude information associated with the resistive-inductive-capacitive sensor and based on the phase and amplitude information, determine at least one of a resonant frequency of the resistive-inductive-capacitive sensor and a transfer function of the resistive-inductive-capacitive sensor.