Patent ID: 8313639

Claim:
A chemical detection device, comprising: an array of chemical detection pixels formed in columns and rows, each column including a plurality of chemical detection pixels, each pixel including: a chemically-sensitive field effect transistor having a body terminal, a first terminal and a second terminal, the first terminal of the chemically-sensitive transistor coupled to a first readout signal line common to all chemical detection pixels of the column and the body terminal coupled to a body biasing voltage source line common to all pixels; a first switch coupling the second terminal of the chemically-sensitive transistor to a current source; and a second switch coupling the second terminal of the chemically-sensitive transistor to a second readout signal line common to all chemical detection pixels of the column; and a plurality of readout circuits, each readout circuit corresponding to a column of chemical detection pixels of the array, each readout circuit including: a first operational amplifier having a first input and a first output, the first input coupled to the second readout signal line common to all chemical detection pixels of a respective column; a second operational amplifier having a second input and a second output, the second output coupled to the first readout signal line common to all chemical detection pixels of the respective column; and a first transistor coupled between the first output and the second input.