Abstract: A storage circuit apparatus includes a support material, a semiconductor chip on which at least one shadow RAM is integrated, a capacitor element and a circuit housing. The storage circuit shadow RAM apparatus is able to perform a STORE operation to secure the RAM content in the non-volatile shadow memory practically independently of the time curve in “power down,” without external accessory circuitry. The capacitor element, consisting at least of electrodes and dielectric, is integrated in the circuit housing, and furnishes the energy required for the STORE operation in power-down.

Abstract: 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.

Abstract: 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.