MEMS Sensor Clock Synchronization Under Internal Timer Drift
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Solution Overview
Problem
Conventional sensor systems face synchronization challenges due to timer drift in internal timers, leading to inaccuracies in sensor sampling and data acquisition, which affects the timing accuracy in MEMS sensor systems.
Innovation Solution
A system and method that involves sending synchronization signals to sensor circuits to adjust their internal timing, allowing them to receive a higher-frequency external clock for more accurate synchronization, and communicating internal timer values to match desired data acquisition and output rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal timers are used for sensor sampling, then device complexity is reduced and ease of operation is improved, but timing accuracy deteriorates due to timer drift
Solution Approach 1:
A host processor acts as an intermediary between the sensor circuit and the external timing source. The host processor receives synchronization signals, determines timing adjustments, and communicates correction values to the sensor circuit, thereby mediating the timing accuracy issue without requiring the sensor circuit itself to be complex
Solution Approach 2:
The system implements a feedback mechanism where the host processor continuously monitors synchronization signals from an external source, calculates timing drift, and sends adjustment commands back to the sensor circuit. This closed-loop feedback enables continuous timing correction while maintaining simple internal timers in the sensor circuit
2Measurement precision
If synchronization signals are continuously sent to correct timer drift, then timing accuracy is improved, but use of energy increases due to continuous communication
Solution Approach 1:
Instead of continuous synchronization, the system uses periodic synchronization signals at strategically determined intervals. The host processor analyzes drift accumulation and sends synchronization commands only when necessary, converting continuous energy consumption into periodic, optimized pulses that maintain accuracy while conserving energy
Solution Approach 2:
The system applies partial synchronization action by sending correction signals at reduced frequency compared to the sensor sampling rate. Since timer drift accumulates gradually, full synchronization at every sampling instant is excessive; periodic partial corrections suffice to maintain acceptable accuracy while reducing energy use
Data Source
AI summary
Various aspects of this disclosure comprise systems and methods for synchronizing sensor data acquisition and/or output. For example, various aspects of this disclosure provide for achieving a desired level of timing accuracy in a MEMS sensor system, even in an implementation in which timer drift is substantial.