MEMS Gyroscope Sensor Feedback Circuit for Vibration Interference
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Solution Overview
Problem
MEMS gyroscopes in portable devices often experience imprecise measurements due to vibrations, which can exceed the measuring range and lead to signal saturation and integrity loss.
Innovation Solution
A sensor system with a feedback circuit that attenuates interference signal components in specific frequency ranges, while maintaining the useful signal components, by using a readout circuit and feedback circuit combination that induces a specific transmission function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mechanical structure is made as stiff as possible to resist vibrations, then the structural strength is improved, but the device complexity increases and the measuring range is reduced
Solution Approach 1:
The patent applies feedback by using a feedback circuit that receives the output signal from the readout circuit and feeds it back to the input, creating a closed-loop system. This feedback mechanism dynamically compensates for vibration-induced interference signals without requiring increased structural stiffness, thereby maintaining measurement accuracy while avoiding the complexity and reduced measuring range associated with rigidifying the mechanical structure.
2Strength
If the mechanical structure is made as stiff as possible to resist vibrations, then the structural strength is improved, but the measuring range is reduced
Solution Approach 1:
The feedback circuit dynamically adjusts the signal processing in real-time to compensate for vibration interference, allowing the sensor to maintain its full measuring range despite structural constraints. This enables the system to adapt to varying vibration conditions without requiring a wider mechanical design that would compromise structural strength.
3Reliability
If vibration resistance is increased through structural stiffening, then the reliability is improved, but the ease of operation is worsened
Solution Approach 1:
The feedback mechanism automatically compensates for vibration effects through electronic signal processing rather than requiring mechanical stiffening. This maintains the ease of operation by keeping the mechanical structure simple and lightweight, while improving reliability through active interference signal suppression in the electronic domain.
4Measurement precision
If the most symmetrical 2-mass structures are used to reduce vibration effects, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Instead of using complex symmetrical 2-mass structures to achieve measurement precision, the patent employs a feedback circuit that actively compensates for vibration effects in the signal processing path. This approach maintains measurement precision while significantly reducing the mechanical structural complexity and number of components required.
5Reliability
If vibration resistance is increased through structural stiffening, then the reliability is improved, but the loss of information increases
Solution Approach 1:
The feedback circuit continuously monitors and compensates for vibration-induced interference signals, preventing them from degrading the useful signal. This active compensation maintains signal integrity and prevents information loss, while avoiding the need for structural stiffening that could introduce other sources of measurement error and reduce reliability.
Data Source
AI summary
A sensor including a sensor element for acquiring a measuring signal, the measuring signal including at least one useful signal component in a useful signal frequency range and at least one interference signal component in an interference signal frequency range, and a readout circuit for converting the measuring signal into an analog electrical sensor signal. A feedback circuit is provided, which feeds back the output signal of the readout circuit to the input of the readout circuit at which the measuring signal is applied, and the total transmission function H(s) of the readout circuit and feedback circuit induces an attenuation of the analog sensor signal in the interference signal frequency range, while the analog sensor signal in the useful signal frequency range is not attenuated.