公开(公告)号：US11125815B2

公开(公告)日：2021-09-21

申请号：US16585963

申请日：2019-09-27

Applicant: Advanced Micro Devices, Inc.

Inventor： Venkat Krishnan Ravikumar ,  Jiann Min Chin ,  Joel Yang Kwang Wei ,  Pey Kin Leong

IPC: G01R31/28 ,  G01R31/265 ,  G01R31/311 ,  G01R23/17 ,  G01R29/08

Abstract: A reconfigurable optic probe is used to measure signals from a device under test. The reconfigurable optic probe is positioned at a target probe location within a cell of the device under test. The cell including a target net to be measured and non-target nets. A test pattern is applied to the cell and a laser probe (LP) waveform is obtained in response. A target net waveform is extracted from the LP waveform by: i) configuring the reconfigurable optic probe to produce a ring-shaped beam having a relatively low-intensity region central to the ring-shaped beam; (ii) re-applying the test pattern to the cell at the target probe location with the relatively low-intensity region applied to the target net and obtaining a cross-talk LP waveform in response; (iii) normalizing the cross-talk LP waveform; and (iv) determining a target net waveform by subtracting the normalized cross-talk LP waveform from the LP waveform.