Patent ID: 9244121
Filing Date: 2016-01-26
CPC Classification: G01J,G01R

Claim Text:
1. A method for state mapping of active devices within a device under test (DUT), comprising: illuminating a selected area of the DUT while the DUT is receiving test signals causing certain of the active devices to modulate, the selected area having at least two of the active devices situated therein and the two active devices modulating at opposing logic states; collecting reflected light from the selected area, the reflected light being modulated by the two active devices modulating at opposing logic states; converting the reflected light modulated by the two active devices into an electrical signal; applying the electrical signal to a lock-in amplifier to extract phase information from the electrical signal of the two active devices to thereby extract the logic states of active devices within the DUT; generating a two-dimensional image from the phase information, wherein the two-dimensional image spatially correlates to the selected area.