Patent ID: 8133369
Filing Date: 2012-03-13
Classification: G01N

Abstract:
1. A biosensor circuit comprising a counter electrode, a reference electrode, a working electrode and a potentiostat circuit, the potentiostat circuit, comprising: a first differential amplifier that receives a scanning voltage at a first input terminal and the voltage of the reference electrode at a second input terminal, and generate an output voltage at an output terminal applied to the working electrode, a feedback loop of the potentiostat circuit being closed between the reference electrode and the working electrode; a first operational amplifier; the output voltage of the first differential amplifier being applied to a first input terminal of the first operational amplifier, which has a negative feedback between an output terminal and a second input terminal, and the working electrode being connected to the second input terminal of the first operational amplifier and held at the voltage of the first input terminal of the first operational amplifier; and a second differential amplifier having a first input terminal connected to the output terminal of the first operational amplifier and a second input terminal connected to the first input terminal of the first operational amplifier.