In Situ Thermal Aging Calibration Corrections for High Temperature MEMS Transducer Arrays
Dynamic matrix corrections combine in situ reference tracking and Arrhenius modeling to eliminate unbudgeted high temperature MEMS recalibration cycles.
Electrostatic Self Test
Diagnostic Protocol
Integrated diagnostic routines in micro-electro-mechanical systems verify the physical and electrical integrity of the sensor element without external physical stimulation. Implementing an electrostatic self test allows the system to apply a known electrostatic force to the internal proof mass, simulating an external acceleration or angular rate. The resulting deflection of the structure is measured by the on-chip readout electronics to confirm proper device operation.
Actuation Force
Applying a specific voltage across dedicated self-test electrodes generates the attractive force necessary to move the microstructure. This actuation force is proportional to the square of the applied voltage and inversely proportional to the square of the gap distance between the electrodes. Because the electrode geometry is fixed during manufacturing, the resulting displacement remains highly predictable and repeatable for a given voltage level.
Calibration Standard
Measurement accuracy of the self-test response is evaluated against the nominal sensitivity values stored in the device registers during factory calibration. Deviations from these reference values can indicate structural damage, particulate contamination or changes in the dampening characteristics of the package gas. Standard limit thresholds dictate whether the device passes or fails the diagnostic sweep.
Signal Validation
The output signal generated during the test sequence is processed by the application processor to ensure it falls within the expected window. An failure in this diagnostic output halts the system startup or triggers a warning flag in the control software.