P. Rajesh George, M. Mary Jermila, Anwar K Backer, A. Anvar, N. Aparna Vishnu
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Drive Mode of MEMS Rate Sensors with Software Phase Locked Loop
A specialized processing and control loop design for a highly stable Software Phase Locked Loop (SPLL) & Digital Amplitude Control Loop (DACL) for MEMS Rate Sensor is discussed. The rate sensor requires good vibration amplitude stability with resonant frequency tracking as well as start-up characteristic with pre-defined frequency response. The control loops are analyzed and simulated in MATLAB, digitally implemented in a custom designed STM32F407 processor board with inbuilt unipolar 12-bit SAR ADC and DAC. Practical test results for different SPLL implementations are compared.