Zentrum Mikroelektronik Dresden Gmbh

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Dr. Johannes Heidenhain Gmbh

Mathias Krauss

Reiner Burgschat

Eberhard Kurth

Christian Kunath

Beate Hildebrandt

A circuit arrangement for the correction of periodic signals from an incremental position measuring system that includes a first assembly comprising a multiplexer having an input to which a periodic signal is supplied and an output out of which an output signal is transmitted, a second assembly that receives the output signal and compares the output signal with at least one preset threshold value and, the second assembly selects a manipulated variable as a function of an actual position of a signal parameter in relation to the at least one preset threshold value from at least two preset, different manipulated variables and an actuating member that performs an action on the signal parameter in order to adjust the signal parameter in a direction toward a preset setpoint value.

Method and circuit for correcting periodic signals of an incremental position measuring system

The invention relates to a capacitive sensor arrangement with a charge balance frequency converter. This consists of an operational amplifier, between the output and inverting input of which an integrating capacitor is connected and the noninverting input of which is connected with a reference potential. Furthermore, the arrangement consists of a first capacitor, one electrode of which can be connected with a first potential or with the reference potential and the other electrode of which can be connected with the reference potential or with the inverting input of the operational amplifier, and a second capacitor, the one electrode of which is connected either with a second potential or with the reference potential and the other electrode of which is connected with the reference potential or with the inverting input. Finally, a comparator is connected to the output of the operational amplifier and the arrangement is provided with a clock oscillator for controlling the switching processes.

Capacitive sensor arrangement

An amplifier circuit for analog-signal processing has an operational amplifier having an output, an inverting input, and supply inputs for accepting a single supply potential and a reference potential. The operational amplifier has a noninverting input capable of accepting a signal voltage of a varying analog signal input thereto which has a positive value range and a negative value range relative to the reference potential. The output is fed back to the inverting input and the operational amplifier has a differential amplifier having first and second field-effect transistors. The first field-effect transistor has a gate connected to the noninverting input of the operational amplifier and the second field-effect transistor has a gate connected to the inverting input. The first field-effect transistor has a threshold voltage lower than a threshold voltage of the second field-effect transistor by an amount at least equal to an amount of a value range of the analog signal voltage outside a range defined by the single supply potential and the reference potential to offset an output signal at the output to within the range defined by the single supply potential and the reference potential.

Amplifier circuit having a pair of differential transistors with

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Ammerbuch, Germany

Mathias Krauss