Patent ID: 8822205

Claim:
An apparatus, comprising: an array of sensors, a plurality of sensors in the array having outputs connected in common to an amplifier node, and each sensor in the plurality including: a chemically-sensitive field effect transistor having a first conduction terminal, a second conduction terminal coupled to a first supply voltage conductor, and a sensor surface; a first transistor having a first conduction terminal coupled to the first conduction terminal of the chemically-sensitive field effect transistor, a second conduction terminal coupled to a second supply voltage conductor, and a gate coupled to a bias voltage conductor; and a second transistor having a gate coupled to a corresponding select voltage conductor, a first conduction terminal coupled to the first conduction terminal of the chemically-sensitive field effect transistor, and a second conduction terminal coupled to the amplifier node; and an amplifier having an input connected to the amplifier node and an output coupled to an output conductor.