Patent ID: 6154043
Filing Date: 2000-11-28
Classification: G01R

Abstract:
An apparatus for identifying a semiconductor die within a set of semiconductor dice formed from a semiconductor wafer, comprising:a variable frequency oscillator configured to produce an a.c. electrical signal at an output port and configured to vary a frequency of the a.c. electrical signal over a selected range of frequencies; anda probe comprising an inductive coil, wherein during use the inductive coil is connected to the output port of the oscillator, and wherein during use the inductive coil is configured to be placed in close proximity to a selected semiconductor die such that the a.c. electrical signal produced by the variable frequency oscillator is coupled to a plurality of parallel-resonant structures formed upon a surface of the selected semiconductor die and such that the probe detects a response to the a.c. electrical signal from each of the structures.