Patent ID: 7976689

Claim:
A gas sensor for determining an oxygen concentration in an exhaust gas of an internal combustion engine with a pump cell, comprising: an outer pump electrode exposed to the exhaust gas, wherein the outer pump electrode is connected to a circuit arrangement via a pump current line; an inner pump electrode exposed to the exhaust gas via a diffusion barrier, wherein the inner pump electrode is connected to the circuit arrangement via a measuring line; a solid electrolyte body interposed between the outer pump electrode and the inner pump electrode; a reference electrode exposed to a reference gas, wherein the reference electrode is connected to the circuit arrangement via a reference pump current line; a sensor heating device, wherein the sensor heating device is connected to the circuit arrangement via a plurality of heating lines; and an instrumentation amplifier adapted to acquire a Nernst voltage between the measuring line and the reference pump current line; wherein the pump current line and one of the plurality of heating lines are electrically coupled, including a grounded node, and wherein the measuring line is adapted to supply a pump current, and wherein the reference pump current line is adapted to supply a reference pump current to the reference electrode and from there to the outer pump electrode.