Patent ID: 8872520
Filing Date: 2014-10-28
Classification: G01N

Abstract:
1. A sensor comprising a substrate carrying a field effect transistor having a gate electrode, the sensor further comprising: a measurement electrode spatially separated from the gate electrode, the measurement electrode being in configurable conductive contact with the gate electrode; a reference electrode; a charge storage element including a first electrode connected to the gate electrode via a node between the measurement electrode and the gate electrode and a second electrode configurably connected to a known potential source, the charge storage element being configured and arranged to drive the gate electrode with a voltage induced by a charge on the charge storage element during a read-out cycle of the sensor; and switching circuitry configured and arranged to connect the charge storage element to the measurement electrode during a data acquisition cycle of the sensor, and in response the measurement electrode reaching a measurement potential, connect the charge storage element to a second potential source during the read-out cycle of the sensor.