Research and development of FET-based biosensors have increased because of their low cost, rapid response, and accurate detection. A bioFET converts a biological response to an analyte into an electrical signal that can easily by measured by DC I-V instrumentation. This application note describes typical bioFETs, explains how the source measure units (SMUs) in the 4200A-SCS Parameter Analyzer are used to perform the I-V characterization of bioFETs, defines common DC I-V tests and the instruments used to make the measurements, and explains measurement considerations for optimal results.
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