| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus that provides a greater signal-to-noise ratio than a measurement obtained by instantaneous voltage measurement, in ion concentration measurement using a chemically sensitive transistor.SOLUTION: A chemical detection circuit includes a current source, a chemical detection pixel, an amplifier and a capacitor. The chemical detection pixel comprises a chemically sensitive transistor that has first and second terminals and a row-select switch coupled between the current source and the chemically sensitive transistor. The amplifier has a first input coupled to an output of the chemically sensitive transistor via a switch, and a second input coupled to an offset voltage line. The capacitor is coupled between an output of the amplifier and the first input of the amplifier. The capacitor and the amplifier form an integrator, and may be shared by a column of chemical detection pixels.SELECTED DRAWING: None |
