Integrated MEMS Amplifier Reduces Component Count
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Solution Overview
Problem
Existing motion sensing technologies, such as those using microelectromechanical (MEMS) sensors, face challenges in efficiently processing capacitance changes to accurately measure linear acceleration and angular velocity due to limitations in amplification and filtering methods, leading to increased component count, power consumption, and processing time.
Innovation Solution
A method and structure for MEMS sensors that generate a charge representative of capacitance changes based on distance, using a periodic signal, and incorporate an amplifier with feedback signals to produce a digital output signal, reducing the need for additional components by integrating amplification and filtering functions within the amplifier itself, thereby minimizing power consumption and package size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional amplification and filtering methods are used separately, then measurement accuracy is maintained, but device complexity and component count increase
Solution Approach 1:
The patent combines the amplification function and filtering function into a single integrated amplifier device. The amplifier includes both an amplification stage and a filtering stage within one component, eliminating the need for separate amplifiers and filters. This merging reduces component count and device complexity while maintaining the ability to accurately process capacitance change signals for motion parameter measurement.
2Use of energy by moving object
If multiple separate components are used for amplification and filtering, then signal processing accuracy is maintained, but power consumption increases
Solution Approach 1:
The integrated amplifier combines multiple signal processing functions (amplification, filtering) into a single power-consuming component. By sharing the power supply and operational infrastructure within one device rather than powering separate amplifiers and filters independently, the total power consumption is reduced while still achieving accurate signal processing through the integrated stages.
3Productivity
If traditional separate amplification and filtering processing is used, then signal accuracy is maintained, but processing time increases
Solution Approach 1:
The integrated amplifier processes signals through amplification and filtering stages simultaneously within a single component architecture, eliminating the sequential processing delay that occurs when signals pass through separate amplifiers and filters. This parallelized integrated processing reduces total processing time while maintaining signal accuracy through carefully designed stage transitions within the unified device.
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 enables efficient processing of capacitance changes, reducing the number of components, power consumption, and processing time while maintaining accurate measurement of motion parameters like linear acceleration and angular velocity, suitable for various applications including gaming, navigation, and automotive systems.
Implementation Method 1
A MEMS sensor may include movable proof masses that can respond to forces such as linear acceleration (e.g., for MEMS accelerometers), angular velocity (e.g., for MEMS gyroscopes), and magnetic field. The operation of these forces on the movable proof masses may be measured based on the movement of the proof masses in response to the forces. In some implementations, this movement is measured based on distance between the movable proof masses and electrodes, which form capacitors for sensing the movement.
Data Source
AI summary
A microelectromechanical (MEMS) sensor has a capacitance that varies based on a sensed force. A charge signal representing that capacitance is provide at an input node of an amplifier of a sense circuit. The sense circuit includes a filter and analog-to-digital converter. Feedback from the filter and the analog-to-digital converter is also received at the input node of the amplifier. The sense circuit outputs a digital signal that is representative of the sensed force.