Abstract: A MEMS accelerometer includes proof masses that move in-phase in response to a sensed linear acceleration. Self-test drive circuitry imparts an out-of-phase movement onto the proof masses. The motion of the proof masses in response to the linear acceleration and the self-test movement is sensed as a sense signal on common sense electrodes. Processing circuitry extracts from a linear acceleration signal corresponding to the in-phase movement due to linear acceleration and a self-test signal corresponding to the out-of-phase movement due to the self-test drive signal.

Abstract: A micro electro-mechanical system (MEMS) gyroscope may include a suspended spring-mass system, and processing circuitry configured to receive a drive sense signal and a proof mass sense signal generated by the spring-mass system. The processing circuitry may be configured to derive a drive velocity in-phase signal from a drive displacement in-phase signal and to derive a drive velocity quadrature signal from a drive displacement quadrature signal. A compensated in-phase signal and a compensated quadrature signal may be determined based upon at least the drive displacement in-phase signal, the drive displacement quadrature signal, the drive velocity in-phase signal, the drive velocity quadrature signal, the sense displacement in-phase signal, and the sense displacement quadrature signal.

Abstract: An algorithm and architecture for sense transfer function estimation injects one or more test signals from a signal generator into a MEMS gyroscope to detect an output signal (e.g., proof mass output sense signal), including an in-phase (e.g., Coriolis) component and a quadrature component. The in-phase and quadrature components are encoded with reference signals to determine phase and/or gain variation and are processed via a variety of components (e.g., matrix rotation, digital gain, tones demodulator, transfer function errors estimation, etc.) to estimate a sense transfer function of the MEMS (e.g., Hs(fd)) and corresponding phase and/or gain offset of Hs(fd). The in-phase and quadrature components are also compensated for phase and/or gain offset by system components.

Abstract: Methods and systems for compensation of a microelectromechanical system (MEMS) sensor may include associating test temperature values with input test signal values, identifying temperature-input signal pairs, and applying one of the test temperature values and one of the test signal values to the MEMS sensor. Desired output signal values may be determined, with each of the desired output signal values corresponding to one of the applied temperature-input signal pairs. Measured output signal values from the MEMS sensor may be measured, with each of the measured output signal values corresponding to one of the applied temperature-input signal pairs. Compensation terms may be determined based on the plurality of temperature-input signal pairs, the corresponding plurality of measured output signal values, and the corresponding plurality of desired output signal values. Compensation terms may be used to modify a sense signal of the MEMS sensor.

Abstract: Methods and systems for compensation of a microelectromechanical system (MEMS) sensor may include associating test temperature values with input test signal values, identifying temperature-input signal pairs, and applying one of the test temperature values and one of the test signal values to the MEMS sensor. Desired output signal values may be determined, with each of the desired output signal values corresponding to one of the applied temperature-input signal pairs. Measured output signal values from the MEMS sensor may be measured, with each of the measured output signal values corresponding to one of the applied temperature-input signal pairs. Compensation terms may be determined based on the plurality of temperature-input signal pairs, the corresponding plurality of measured output signal values, and the corresponding plurality of desired output signal values. Compensation terms may be used to modify a sense signal of the MEMS sensor.

Abstract: A MEMS accelerometer includes proof masses that move in-phase in response to a sensed linear acceleration. Self-test drive circuitry imparts an out-of-phase movement onto the proof masses. The motion of the proof masses in response to the linear acceleration and the self-test movement is sensed as a sense signal on common sense electrodes. Processing circuitry extracts from a linear acceleration signal corresponding to the in-phase movement due to linear acceleration and a self-test signal corresponding to the out-of-phase movement due to the self-test drive signal.

Abstract: A MEMS accelerometer includes proof masses that move in-phase in response to a sensed linear acceleration. Self-test drive circuitry imparts an out-of-phase movement onto the proof masses. The motion of the proof masses in response to the linear acceleration and the self-test movement is sensed as a sense signal on common sense electrodes. Processing circuitry extracts from a linear acceleration signal corresponding to the in-phase movement due to linear acceleration and a self-test signal corresponding to the out-of-phase movement due to the self-test drive signal.

Abstract: A micro electro-mechanical system (MEMS) gyroscope may include a suspended spring-mass system, and processing circuitry configured to receive a drive sense signal and a proof mass sense signal generated by the spring-mass system. The processing circuitry may be configured to derive a drive velocity in-phase signal from a drive displacement in-phase signal and to derive a drive velocity quadrature signal from a drive displacement quadrature signal. A compensated in-phase signal and a compensated quadrature signal may be determined based upon at least the drive displacement in-phase signal, the drive displacement quadrature signal, the drive velocity in-phase signal, the drive velocity quadrature signal, the sense displacement in-phase signal, and the sense displacement quadrature signal.

Abstract: A MEMS accelerometer includes proof masses that move in-phase in response to a sensed linear acceleration. Self-test drive circuitry imparts an out-of-phase movement onto the proof masses. The motion of the proof masses in response to the linear acceleration and the self-test movement is sensed as a sense signal on common sense electrodes. Processing circuitry extracts from a linear acceleration signal corresponding to the in-phase movement due to linear acceleration and a self-test signal corresponding to the out-of-phase movement due to the self-test drive signal.

Abstract: A MEMS inertial sensor may include drive electrodes that apply a drive signal to a suspended spring-mass system for measurement of an inertial linear or angular force and self-test electrodes that apply a self-test signal to the suspended spring-mass system for monitoring the characteristics of the suspended spring-mass system during operation. The self-test signal may be modulated by a spreading sequence that prevents interference with the self-test signal by vibrations and other disturbance signals. The self-test signals and drive signals may be modulated with CDMA code sequences to multiplex signals that are at least partially processed by a common sense path.

Abstract: Disclosed herein is a method and apparatus for converting a stream of samples at a first sampling rate to a stream of samples at a second sampling rate. An exemplary method includes measuring the first sampling rate; determining a first upsampling factor from a basis including: the measured first sampling rate, the target value of the second sampling rate, and a resynchronisation error factor, the first upsampling factor being constrained to be an integer power of a predetermined integer value; and deriving, from a reference set of filter coefficients and from a ratio of the first upsampling factor to a reference upsampling factor, a first set of filter coefficients for use in a first interpolation filter, the reference set of filter coefficients being for a reference upsampling factor that is an integer power of the predetermined integer value.

Abstract: A method of converting a stream of samples at a first sampling rate to a stream of samples at a second sampling rate is disclosed, comprising: measuring the first sampling rate; determining a first upsampling factor from a basis comprising: the measured first sampling rate, the target value of the second sampling rate, and a resynchronisation error factor, the first upsampling factor being constrained to be an integer power of a predetermined integer value; and deriving, from a reference set of filter coefficients and from a ratio of the first upsampling factor to a reference upsampling factor, a first set of filter coefficients for use in a first interpolation filter, the reference set of filter coefficients being for a reference upsampling factor that is an integer power of the predetermined integer value.

Abstract: A communication method between a sensor device associated with a vehicle tyre and a coordinator device on the vehicle body, includes: wirelessly transmitting data from the sensor device to the coordinator device with ultra wide band signals; at the coordinator device, wirelessly receiving the data transmitted by the sensor device by performing an energy detection of the signals received; wirelessly transmitting data from the coordinator device to the sensor device with narrowband radio signals; and at the sensor device, wirelessly receiving the data transmitted by the coordinator device by performing an envelope detection of the received signals.

Abstract: The method is based on a controlled, direct insertion/cancellation of samples in a processed data stream. An up-sampled data stream is generated by the input block providing signal samples having a frequency rate. An intermediate data stream generated by a Rate Adapting Stage providing signal samples adapted to an intermediate frequency rate. An output data stream is delivered by a final low pass filter, including M signal samples having a desired output sample frequency rate. The method provides a generation of an up-sampled weighted stream in the Rate Adapting Stage by weighting the signal samples of the up-sampled data stream via a set of weight. Then, the input frequency rate is adapted to the output frequency rate in Rate Adapting Stage by a direct insertion of zero samples into the processed stream when L<M, or by a direct cancellation of samples when L>M.

Abstract: An up-sampled data stream, upsampled times a factor P, is generated by the input block providing signal samples having a frequency rate, while an intermediate data stream is generated by a Rate Adapting Stage providing signal samples adapted to an intermediate frequency rate. An output data stream is delivered by a final low pass filter, and includes M signal samples having a desired output sample frequency rate (fOUT=M/Ts). The method provides generation of a provisional stream in the Rate Adapting Stage, wherein this provisional stream is affected by aliases falling within the output Nyquist band [?fOUT/2, fOUT/2], although being adapted to the output frequency rate by a direct insertion of zero samples into the processed stream when L<M, or by a direct cancellation of samples when L>M. Then these aliases are suppressed in the Rate Adapting Stage by weighting the provisional stream via a set of weights.