Sensor-Supported Microphone Environmental Drift Compensation
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Solution Overview
Problem
Microelectromechanical system (MEMS) devices, such as microphones, are sensitive to environmental conditions like temperature and stress, leading to drift in performance parameters, which affects their accuracy and reliability, and existing designs face constraints due to these sensitivities.
Innovation Solution
Integration of an environmental sensor with the MEMS device to calibrate and correct the output signals using polynomial functions and coefficients, allowing for real-time adjustment of sensitivity and drift compensation, either at the device level or system level, to improve signal accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If MEMS devices are designed to be compact and integrated, then device size and integration are improved, but sensitivity to environmental conditions increases
Solution Approach 1:
The patent introduces an environmental sensor as an intermediary component that measures environmental conditions (temperature, stress) and provides data to a calibration system. This mediator enables the system to detect and compensate for environmental effects without changing the compact MEMS structure, thus resolving the contradiction between small size and environmental sensitivity.
Solution Approach 2:
The patent applies parameter changes by using calibration data that relates transducer sensitivity to environmental measurements. The system dynamically adjusts sensitivity parameters based on measured environmental conditions, allowing the compact device to maintain accurate performance despite environmental variations through software-based parameter adjustment rather than physical redesign.
2Measurement precision
If environmental calibration is implemented at device level, then signal accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the environmental sensor, calibration parameter storage, and correction logic into an integrated device-level system. By combining these functions within the same package, the system achieves high signal accuracy without proportionally increasing complexity, as the components work together in a coordinated manner rather than as separate add-ons.
Solution Approach 2:
The device performs self-calibration by automatically reading environmental measurements, retrieving appropriate calibration parameters, and adjusting its output signals without external intervention. This self-service capability improves signal accuracy while minimizing the complexity of external calibration systems, as the device handles its own environmental compensation.
3Speed
If calibration data is stored in device, then correction speed is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing calibration data in the device during manufacturing. This pre-prepared calibration information enables rapid real-time correction without requiring complex calculations during operation, thus improving correction speed while keeping manufacturing processes standardized and manageable through offline calibration procedures.
Data Source
AI summary
A system and method for a sensor-supported microphone includes an amplifier having an input configured to be coupled to a transducer, and an output coupled to an analog interface to output a transduced electrical signal from the transducer, a data bus configured to be coupled to an environmental sensor, a calibration parameter storage circuit coupled to the data bus, the calibration parameter storage circuit comprising calibration data relating sensitivity of the transducer with environmental measurements provided by the environmental sensor, and a digital interface coupled to the data bus and configured to output the calibration data and the environmental measurements.