A new, simple and cost effective photo emission microscope (PEM) for continuous wavelength measurement is proposed (SPEMMI: Spectroscopic Photo Emission Microscope). The new system uses only one sensitive detector (GENIII-NIR) for both conventional failure detection and spectral analysis. The spectrometer and the mechanical parts, used to build up the SPEMMI, are presented. Also the required calibration procedures are discussed. To demonstrate the functionality of the new system, spectra of hot carriers in a saturated NMOS transistor and of a diode in forward and reverse biased conditions are discussed. In addition, the application of SPEMMI for determination of failures that occur in industrial IoDQ-failed VLSI chips is illustrated.

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