A computer system identifies active nets in a netlist of a circuit design by performing simulation of the netlist. A discrete Fourier transform of the averaged outputs can be obtained and the DFT components can be multiplied by corresponding transformed companion components related to the probe components. Because all of any LE-output-to-LE-input connections of LEs that are working together in a LAB must be routed through the general-purpose input routing resources of the LAB, it is important to conserve those resources. In addition, the pre-processed data is transformed into subject-oriented data by utilizing reusable primary keys and Relational Database Management System dates in the source system to link related pre-processed data. The device may be mounted either permanently or releasably removable from the biopsy andor sampling instrument.