Robert Daniel McGrath

Title: Innovations of Robert Daniel McGrath

Introduction

Robert Daniel McGrath is a notable inventor based in Andover, MA, with a focus on advancements in image sensing technology. He holds three patents that showcase his contributions to the field of imaging devices. His work emphasizes improving image quality and efficiency in image sensors.

Latest Patents

One of his latest patents is for an active-pixel image sensing device with linear mode voltage to current conversion. This invention includes active pixels with a charge accumulation region that collects charges generated by a photosensitive element, such as a photodiode. The design incorporates a linear voltage to current converter, current mirrors, and a differential amplifier to generate an output signal while minimizing fixed pattern noise and enhancing the signal-to-noise ratio. Additionally, the image quality is improved by reducing pixel blooming and image smearing through an innovative method for resetting the pixels with a bias voltage reference that is less than Vdd. The active circuitry and physical device layout also mitigate the effects of IR voltage drops along the bus lines in a massive pixel array.

Another significant patent is for a CMOS imager with improved sensitivity. This invention presents an improved pixel design for a CMOS image sensor with a small feature size. In conventional designs, the quantum efficiency is often reduced due to the decreased thickness of the top n-type layer of the photodiode and the presence of a higher doped p-type layer. McGrath's design omits the higher doped p-type layer underneath the photodiode, allowing barrier regions to channel the carriers generated by impinging radiation towards the top n-layer of the photodiode. This results in high quantum efficiency despite a shrinking feature size, and the novel pixel design can also incorporate anti-blooming protection.

Career Highlights

Throughout his career, Robert Daniel McGrath has worked with Texas Instruments Corporation, where he contributed to various innovative projects in imaging technology. His expertise in the field has led to significant advancements in image sensor design and functionality.

Collaborations

Some of his notable coworkers include William D Washkurak and Joao Pedro Carreira, who have collaborated with him on various projects, enhancing the development of imaging technologies.

Conclusion

Robert Daniel McGrath's contributions to the field of image sensing technology through his patents and collaborations highlight his innovative spirit and dedication to improving image quality and efficiency. His work continues to influence