Albert-ludwigs-universitat Freiburg

Continental Teves, Ag and Company Ohg

Hahn-schickard-gesellschaft Fur Angewandte Forschung E.v.

Hahn-schickard-gesellschaft Fuer Angewandte Forschung E.v.

Albert-ludwigs-university of Freiburg

Michael Maurer

Yiannos Manoli

Markus Kuderer

Armin Taschwer

Andreas Kugi

Markus Egretzberger

Florian Mair

Thomas Northemann

Sebastian Nessler

The present invention relates to an operational amplifier, including: a symmetrical differential amplifier; a local common mode feedback circuit coupled to the symmetrical differential amplifier; a tail current source circuit including at least one first transistor and a second transistor and a current source resistor. The tail current source circuit is configured to adjust a control voltage of the first transistor by using the second transistor such that a predetermined reference current flows through a load path of the first transistor.

Operational amplifier and method for operating an operational amplifier

A circuitry for an incremental delta-sigma modulator includes at least an incremental delta-sigma modulator and a sample-and-hold element, the sample-and-hold element being arranged in front of the incremental delta-sigma modulator and providing an input voltage for the incremental delta-sigma modulator in the charged state, wherein the sample-and-hold element includes a capacitor for charging the input voltage for the incremental delta-sigma modulator, wherein a first switch is arranged in front of the capacitor, and a second switch is arranged behind the capacitor, wherein the first switch is open when the second switch is closed so as to provide, at the incremental delta-sigma modulator, an input voltage decreasing in amount, in particular a decaying input voltage, or wherein the second switch is open when the first switch is closed so as to charge the capacitor of the sample-and-hold element. In addition, a method of operating a circuitry for an incremental delta-sigma modulator is proposed.

Circuitry including at least a delta-sigma modulator and a sample-and-hold element

The present invention relates to a circuit arrangement and a method for reading a capacitive vibratory gyroscope with an at least primary mass and at least one secondary mass that is connected to the primary mass, wherein the primary mass is excited to a primary vibration during operation, and wherein the secondary mass is deflected out of a resting position in a direction that is transversal to the primary vibration when the vibratory gyro-scope rotates around a sensitive axis. The circuit arrangement comprises a delta-sigma modulator with at least one control loop to perform a force feedback that resets the secondary mass into its resting state by applying a reset signal, wherein the reset signal forms a modulator output signal of the delta-sigma modulator, a correction unit that receives the modulator output signal and that is operated to generate a corrected modulator output signal that corresponds to an actually acting feedback force, a demodulator that is connected to the correction unit for demodulation of the corrected modulator output signal, and a filter arrangement to filter the demodulated signals and to output a rotary rate signal.

Circuit arrangement and method for the digital correction of modulation effects in electromechanical delta-sigma modulators

The present invention relates to a circuit arrangement and a method for reading a capacitive vibratory gyroscope with an at least primary mass and at least one secondary mass that is connected to the primary mass, wherein the primary mass is excited to a primary vibration during operation, and wherein the secondary mass is deflected out of a resting position in a direction that is transversal to the primary vibration when the vibratory gyroscope rotates around a sensitive axis. The circuit arrangement comprises a delta-sigma modulator with at least one control loop to perform a force feedback that resets the secondary mass into its resting state by applying a reset signal, wherein the reset signal forms a modulator output signal of the delta-sigma modulator, a correction unit that receives the modulator output signal and that is operated to generate a corrected modulator output signal that corresponds to an actually acting feedback force, a demodulator that is connected to the correction unit for demodulation of the corrected modulator output signal, and a filter arrangement to filter the demodulated signals and to output a rotary rate signal.

Circular system and method for the digital correction of modulation effects in eletromechanical delta-sigma modulators

The invention relates to a detection circuit for reading out at least one position signal of a micromechanical capacitive sensor having at least one oscillating element that can be excited so as to move in an oscillating manner. In particular, the invention relates to a sensor that is operated in a closed control loop by using the detection circuit according to the invention. The invention further relates to a method for operating such a sensor. During operation, a first input connection of the detection circuit () is connected to an output connection of the capacitive sensor () and an output connection of the detection circuit () is connected to a loop filter of a control loop (), wherein the control loop feeds back a feedback voltage for providing a restoring force in dependence on an output voltage of the control loop () to a second input connection of the detection circuit (). The detection circuit () comprises at least one further feedback branch (R, C), and the output voltage of the control loop () is modulated onto an in-phase input voltage of the detection circuit.

Method and circuit for the time-continuous detection of the position of the sensor mass with simultaneous feedback for capacitive sensors

A method for the precise measuring operating of a micro-mechanical rotation rate sensor, including at least one seismic mass, at least one drive device for driving the seismic mass in the primary mode (q) and at least three trimming electrode elements which are jointly associated directly or indirectly with the seismic mass. An electric trimming voltage (u, u, u, u) is set respectively between the trimming electrode elements and the seismic mass. Each of the electric trimming voltages (u, u, u, u) are adjusted in accordance with a resonance frequency variable (&#x169;, &#x168;), a quadrature variable (&#x169;, &#x168;) and a restoring variable (&#x169;).

Method for the decoupled control of the quadrature and the resonance frequency of a micro-mechanical rotation rate sensor by means of sigma-delta-modulation

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Rheinhausen, Germany

Michael Maurer