MEMS Sensor Power Ramping for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-density devices like smartphones and hearing aids, interactions between compact components lead to thermal and electrical noise, affecting the performance of MEMS devices by introducing inaccuracies in acoustic information due to rapid current spikes during power transitions.
Innovation Solution
A MEMS device with a power supply that controls current transitions using ramp-up and ramp-down profiles with attenuated high-frequency components, reducing thermal and electrical noise effects by extending transition times, thereby improving the accuracy of acoustic information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If rapid current transitions are used during power supply to the sensor, then power efficiency is improved, but thermal and electrical noise increase affecting acoustic information accuracy
Solution Approach 1:
The patent applies dynamics by transitioning from static, abrupt current switching to dynamic, controlled current ramping. The power supply circuit generates ramp-up and ramp-down current profiles that gradually change current levels over time, allowing the system to adapt smoothly between power states while minimizing noise generation and maintaining acoustic measurement precision
Solution Approach 2:
The patent changes the temporal parameter of current delivery by extending the transition time from instantaneous switching to controlled ramping over a defined period. This parameter change in current delivery timing reduces high-frequency noise components while maintaining power efficiency, directly resolving the contradiction between power efficiency and measurement precision
2Volume of moving object
If compact components are used to achieve high-density devices, then device size is reduced, but interactions between components increase causing thermal and electrical noise
Solution Approach 1:
The patent introduces an intermediary function in the power supply circuit that mediates between the sensor's power requirements and the acoustic device's noise sensitivity. The ramping circuit acts as an intermediary element that shapes current transitions to minimize noise propagation to the acoustic sensor, allowing compact component placement without suffering from noise interference
Solution Approach 2:
The patent extracts and addresses the noise generation mechanism separately from the main acoustic sensing function. By identifying and treating the current transition phase as a distinct noise source, the patent applies specific ramping control to eliminate harmful thermal and electrical noise while maintaining the benefits of compact high-density component arrangement
Data Source
AI summary
A microelectromechanical system (MEMS) device includes at least one substrate, a lid, a MEMS component, a sensor, and a power supply. The lid is coupled to the substrate so that the substrate and the lid cooperatively define an interior cavity. The MEMS component is disposed within the interior cavity. The sensor is disposed within the interior cavity and is arranged to detect a parameter of the interior cavity. The power supply provides current to the sensor. The power supply is configured to control current during a ramp-up transition of the current and a ramp-down transition of the current such that the ramp-up transition and the ramp-down transition have attenuated high-frequency components.