Pressure sensor arrangement comprising a pressure sensor, a reference element and a measurement circuit

: Zimmer, G.; Eichholz, J.; Mokwa, W.; Kandler, M.; Manoli, Y.

Abstract
A pressure sensor arrangement comprising a pressure sensor, a reference element and measurement circuit, attains a high measurement accuracy by the fact that the measurement circuit is a switch capacitance measurement circuit, the pressure sensor is applied with a first potential during a first switching state of the switch capacitance measurement circuit and is applied with a second potential in a second switching state, the pressure sensor is connected to a switch capacitance measurement circuit by a second electrode via the inverting input of an operational amplifier, the reference element is located between the inverting input of the operational amplifier and its output and is discharged during one of the two switching states, and the non-inverting input of the operational amplifier is applied with a reference potential.