Guoqing Xiao is a prominent inventor based in Saratoga, California, known for his significant contributions to optical probing technologies. With a total of eight patents to his name, he has developed innovative methods that enhance the performance of integrated circuit testing.

Latest Patents

One of Guoqing Xiao's latest patents is the Adjustable Split-Beam Optical Probing (ASOP). This practical method greatly enhances the strength of the modulated signal from laser probing of integrated circuits (ICs). The technique involves scanning an IC device under test (DUT) with two spatially separated laser beams. The output from a single laser source is split into two components, each focused on different areas of the DUT. The separation and intensity of the beams are adjustable to maximize the strength of the modulated return signal. Typically, a near-infrared (NIR) laser is used with flip-chip IC devices to account for the band-gap characteristics of the substrate material. Upon reflection from the DUT, the beams are recombined to interfere with one another, allowing for maximum interference and improved signal-to-noise ratio. This method significantly reduces the time required to acquire useful voltage waveforms.

Another notable patent is the Multi-Magnification High Sensitivity Optical System for Probing Electronic Devices. This optical probe system is designed for probing electronic devices and includes a sample plate to hold the target device, a temperature control chamber, and a first optical objective system. The system allows for precise movement and focusing on the target device, enhancing the accuracy of the probing process.

Career Highlights

Guoqing Xiao works at Checkpoint Technologies LLC, where he continues to innovate in the field of optical probing. His work has been instrumental in advancing the capabilities of electronic device testing, making significant contributions to the industry.

Collaborations

Throughout his career, Guoqing has collaborated with notable colleagues, including Thomas E. Clawges and David J. Morgan. These collaborations have further enriched his work and contributed to the development of cutting-edge technologies.

Conclusion

Guoqing Xiao is a distinguished inventor whose work in optical probing technologies has made a lasting impact on the field of integrated circuit testing. His innovative patents and contributions continue to shape the future of electronic device testing.

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