Abstract:
A micromechanical angular acceleration sensor for measuring an angular acceleration is disclosed. The sensor includes a substrate, a seismic mass, at least one suspension, which fixes the seismic mass to the substrate in a deflectable manner, and at least one piezoresistive and/or piezoelectric element for measuring the angular acceleration. The piezoresistive and/or piezoelectric element is arranged in a cutout of the seismic mass. A corresponding method and uses of the sensor are also disclosed.
Abstract:
A micromechanical angular acceleration sensor for measuring an angular acceleration is disclosed. The sensor includes a substrate, a seismic mass, at least one suspension, which fixes the seismic mass to the substrate in a deflectable manner, and at least one piezoresistive and/or piezoelectric element for measuring the angular acceleration. The piezoresistive and/or piezoelectric element is arranged in a cutout of the seismic mass. A corresponding method and uses of the sensor are also disclosed.
Abstract:
A method for connecting at least one sensor or actuator to a time-controlled bus system, the sensor or actuator carrying out a signal processing in at least two phases, the signal processing in a first phase taking place at a higher speed than in a second phase, the sensor or actuator being synchronized to a time, which is external to the sensor, of the time-controlled bus system in at least one of the phases.
Abstract:
A yaw rate sensor includes a drive mass element which is situated above a surface of a substrate and is drivable to vibrate by a drive device along a first axis extending along the surface, having a detection mass element, which is deflectable under the influence of a Coriolis force along a second axis perpendicular to the surface, and having a detection device by which the deflection of the detection mass element along the second axis is detectable. Due to the arrangement of the second axis perpendicular to the surface, the yaw rate sensor may be integrated into a chip together with additional yaw rate sensors suitable for detection of rotations about axes of rotation in other directions.
Abstract:
A delta sigma modulator includes an oscillatory system having a natural frequency and an electronics and a control loop which acts upon the electronics from the oscillatory system and again upon the oscillatory system from the electronics. The control loop provides that a gain in the control loop demonstrates a peaking in a frequency range around the natural frequency of the oscillatory system.
Abstract:
The yaw rate sensor of the present invention has force-conveying means. The central idea of the invention is that the force action conveyed by this arrangement has a frequency such that the frequency of the conveyed force action is an integral multiple of the frequency of the oscillation of the drive element parallel to the X-axis.
Abstract:
A micromechanical motion sensor is capable of detecting a deflection imparted to an oscillatably mounted bar spring element excited to a permanent periodic oscillation by an electrostatic oscillating drive to which a periodic drive voltage is applied. To compensate non-linearities of the resonance frequency response of the bar spring element, a sum of a normal drive voltage signal and a compensation drive signal may be applied to a comb drive. In an alternative embodiment, separate compensation comb drive units may be additionally provided to the comb drive units used for the oscillation drive and a compensation voltage signal may be applied to them to compensate for the non-linearity.
Abstract:
A method and a system for detecting the spatial movement state of moving objects, e.g., vehicles. Due to a, for example, non-cartesian arrangement of four rotational rate sensors and/or acceleration sensors, it is also possible to obtain a redundant signal in addition to the desired useful signal indicating the spatial movement state, e.g., the rotational movement and/or acceleration in space; if this redundant signal is large enough in comparison with the rotational rate actually applied, it may be used for detection of the size of the error and the defective sensor. The four sensors are mounted, for example, on a sensor platform forming a three-sided truncated pyramid so that all possible three-way combinations of sensors are mutually linearly independent. The accuracy about the vertical axis is defined by the angle of inclination of the side faces of the truncated pyramid.
Abstract:
The invention relates to a device for generating bias voltages for the electrodes of a rotation rate sensor. By evaluating a rotation rate signal and a quadrature signal, control signals are generated, using an adaptive quadrature compensator, that are converted by means of a bias voltage generating arrangement into bias voltages that are delivered to the electrodes of an electrode arrangement disposed underneath the seismic mass or masses of the rotation rate sensor. As a result, the sensor structure can be inclined in such a way that the quadrature signal occurring at the output is minimized. In accordance with a further feature of the invention, the bias voltages generated by the bias voltage generating arrangement are modified, as a function of the output signal of a bandwidth adjusting circuit, in such a way that the amplitude frequency response of the detection motion has a desired bandwidth.
Abstract:
A yaw-rate sensor for determining a Coriolis force includes a semiconductor substrate, a mass body mounted so it is movable over the semiconductor substrate, a drive unit for setting the mass body into an oscillating movement, and a detection unit for determining a deflection of the mass body which is caused by the Coriolis force. The detection unit includes a piezoresistive element, whose electrical resistance is a function of the deformation of the piezoresistive element.