Viktor Gruev

Title: Viktor Gruev: Innovator in CMOS Image Sensor Technology

Introduction

Viktor Gruev is a prominent inventor based in Philadelphia, PA (US), known for his contributions to the field of image sensor technology. He holds a total of 3 patents that showcase his innovative approach to enhancing imaging systems. His work primarily focuses on developing advanced CMOS image sensors that improve image quality and operational efficiency.

Latest Patents

One of Gruev's latest patents is the "CMOS linear voltage/current dual-mode imager." This invention features a CMOS image sensor capable of both voltage- and current-mode operations, selecting the mode based on the position of mode switches. Each pixel on the imager includes a single transistor that acts as either a source follower for voltage readout or a transconductor for current readout. The two modes share the same readout lines but have distinct correlated double sampling (CDS) units for noise suppression. This design allows for high linearity through a current-mode readout technique using a velocity-saturated short-channel transistor. Additionally, an image array can be formed with a mixture of three types of pixels, all equipped with identical photodiodes and access switches.

Another significant patent is the "Current/voltage mode image sensor with switchless active pixels." This invention presents a voltage and current mode active pixel sensor designed for high-resolution imaging. The photo pixel consists of a photodiode and two transistors: a reset transistor and a transconductance amplifier transistor. By relocating the switch transistor outside the pixel, Gruev's design achieves lower pixel pitch and enhanced linearity of the output photocurrent. The reset and amplifier transistors can be shared among adjacent pixels, improving the overall performance of the image sensor.

Career Highlights

Viktor Gruev is affiliated with the University of Pennsylvania, where he continues to advance research in imaging technologies. His work has significantly impacted the field, leading to innovations that enhance the performance of image sensors in various applications.

Collaborations

Gruev has collaborated with notable colleagues, including Jan Van Der Spiegel and Zheng Yang, contributing to the advancement of imaging technology through shared expertise and innovative ideas.

Conclusion

Viktor Gruev's contributions to CMOS image sensor technology exemplify his commitment to innovation and excellence in the field. His patents reflect a deep understanding