Patent ID: 6804620
Filing Date: 2004-10-12
Classification: G01R

Abstract:
In a test system for testing a semiconductor device under test (DUT), the test system having a plurality of functional pins and one or more precision measurement units (PMUs), a method for determining calibration data for the functional pins of the test system, comprising:assigning one functional pin in the test system as a reference pin (R_PIN) and one PMU as a reference PMU; taking a particular measurement of the reference pin using external test equipment (R_PINEXT) and the reference PMU (R_PINPMU); determining a PMU error (PMU_ERR) for the particular measurement by computing R_PINPMUâˆ’R_PINEXT; and for every functional pin X to be calibrated, connecting functional pin X to the reference pin, taking the particular measurement of functional pin X (F_PIN_XPMU) using the reference PMU, determining a corrected particular measurement of functional pin X (F_PIN_XPMUâ€”CORR) by computing F_PIN_XPMUâˆ’PMU_ERR, and determining calibration data for the particular measurement of functional pin X by computing F_PIN_XPMUâ€”CORRâˆ’R_PINEXT.