Apparatus having reduced noise and method of using the apparatus for detecting ionic materials

摘要

An apparatus and method for detecting ionic materials includes a sensing electrode (31) which contacts a liquid sample and detects a sensing voltage corresponding to a surface potential which is changed by a concentration of ionic materials in the liquid sample, a first switching transistor (TR1) having a first terminal connected to the sensing electrode and a second terminal connected to a first node (N1), a second switching transistor (TR2) having a first terminal connected to a reset voltage and a second terminal connected to the first node, and a sensing transistor (STR) having a gate connected to the first node.