Patent ID: 8648395

Claim:
An integrated sensor device comprising: MOS circuits in a semiconductor substrate, an interconnect stack comprising interconnect levels having interconnect conductors and insulating dielectric, said interconnect levels being over the substrate and interconnecting the MOS circuits, a sensor including: electrodes embedded in the insulating dielectric and being integrally formed with the interconnect conductors, the electrodes including electrodes for forming a capacitive sensor and electrodes for forming a resistive sensor, and a porous material for ingress of gas or humidity being sensed, and wherein the MOS circuits include an A-to-D converter for processing signals from the sensor electrodes, said A-to-D converter converting analog data to digital data, the digital data utilized when performing gas concentration measurements by detecting together changes of conductivity of the sensor porous material detected at the resistive sensor and changes of dielectric constant of the sensor porous material detected at the capacitive sensor.