Patent ID: 7914655
Filing Date: 2011-03-29
Classification: C12Q,G01N,G01R

Abstract:
1. A circuit arrangement, comprising: a sensor electrode; a first circuit unit, electrically coupled to the sensor electrode; a second circuit unit, including a first capacitor, the first circuit unit configured to hold the electrical potential of the sensor electrode in a first reference range around an electrical first desired potential by coupling the first capacitor and the sensor electrode such that the electrical potential of the sensor electrode is matchable, a collector electrode; a third circuit unit, electrically coupled to the collector electrode; and a fourth circuit unit, including a second capacitor, the third circuit unit configured to hold the electrical potential of the collector electrode in a second reference range around an electrical second desired potential by coupling the second capacitor and the collector electrode such that the electrical potential of the collector electrode is matchable, the second circuit unit and the fourth circuit unit configured to detect if the potential of the second capacitor is outside a second reference range and configured to bring the second capacitor to a second electrical reference potential.