Circuit arrangement, electrochemical sensor, sensor arrangement, and method for processing a current signal provided via a sensor electrode

US7123029B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Alexander Frey · Munich, DE
• Christian Paulus · Weilheim, DE
• Meinrad Schienle · Ottobrunn, DE
• Roland Thewes · Puchheim, DE

Key dates

• Filing date: Aug 5, 2004
• Grant date: Oct 17, 2006
• Expiry date: Dec 31, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/3276
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Circuit arrangement having a sensor electrode, a first circuit unit, which is electrically coupled to the sensor electrode, and a second circuit unit, which has a first capacitor. The first circuit unit holds an electrical potential of the sensor electrode in a predetermined first reference range around a predetermined electrical desired potential by coupling the first capacitor and the sensor electrode such that there is a matching of their electrical potentials. If the second circuit unit detects the electrical potential of the first capacitor being outside a second reference range, the second circuit unit brings the first capacitor to a first electrical reference potential.