Electronic biosensor arrangement

Details Electronic biosensor arrangement Electronic biosensor arrangement

2007-05-15

2011-10-25

Yu, Melanie J (Department: 1641)

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing liquid or solid sample

C422S050000, C422S068100, C435S007100, C435S283100

Reexamination Certificate

active

08043563

ABSTRACT:
An electronic biosensor arrangement (1), comprising a receiving region (2) for biological material, a sensor-electrode arrangement (3) with sensor electrodes (3a,3b) which intermesh in a comb-like manner being associated therewith, with which sensor electrodes (3a,3b) a measuring circuit (5) is connectable for measuring an electrical measurement parameter on the sensor electrodes (3a,3b) and influenced by biological material, wherein the sensor electrodes (3a,3b) form a plurality of sensor capacitors (Csensor,1to Csensor,N), with which electronic switching means (S2,1to S2,N) driven by a control logic (8) are associated for connecting to earth or to a voltage source carrying a measurement voltage (Vdrive), respectively, comprising a reference capacitor (Cref), to which a switching means (S1) driven by the control logic (8) and arranged for optionally connecting to earth or to the measurement voltage (Vdrive) is likewise assigned, wherein the capacitors (Cref, Csensor1−Csensor, N) are also combined to a node (A), which is connected to an input (−) of a differential amplifier (10), and with which measurement capacitors (C0to C5) having binary-weighted capacities (Cminto 32Cmin) are furthermore connected for forming an SAR comparison unit, with the measurement capacitors being also selectively connectable via switching means (S3,0to S3,5) driven by the control logic (8) to a voltage source (Varray) or to earth for the purpose of providing charge-difference for SAR conversion.

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