| 摘要 |
Electronic biosensor arrangement (1) comprising a receptacle region (2) f or biological material, to which is assigned a sensor electrode arrangement (3) with sensor electrodes (3a, 3b) intermeshing in comblike fashion, to whi ch can be connected a measuring circuit (5) for measuring an electrical meas urement quantity influenced by biological material at the sensor electrodes (3a, 3b), wherein the sensor electrodes (3a, 3b) form a multiplicity of sens or capacitors (Csensor,1 to Csensor,N) which are assigned electronic switchi ng means (S2,1 to S2,N) - driven by a control logic (8) - for connection to earth or to a voltage source carrying a measurement voltage (Vdrive), compri sing a reference capacitor (Cref), which is likewise assigned a switching me ans (S1) - driven by the control logic (8) - for optional connection to eart h or to the measurement voltage (Vdrive), wherein the capacitors (Cref, Csen sor,1 - Csensor,N) are on the other hand combined at a node (A), which is co nnected to an input (-) of a differential amplifier (10) and to which are fu rthermore connected measuring capacitors (C0 to C5) having binary weighted c apacitances (Cmin to 32Cmin) for forming an SAR comparison unit, which, on t he other hand, via switching means (S3,0 to S3,5) driven by the control logi c (8), are able to be connected selectively toa voltage source (Varray) or t o earth for the purpose of charge difference formation for the SAR conversio n. |
