Physical unclonable function circuit for CMOS dynamic visual image sensor

Abstract

The invention provides a physical unclonable function circuit for a CMOS dynamic visual image sensor. The physical unclonable function circuit comprises an external excitation source, a column decoder, a row decoder, a 16 * 16 pixel circuit array, a column selection output circuit and a reading circuit. The pixel circuit array comprises 256 pixel circuits in total, and the pixel circuit array is responsible for generating 256 output voltages Vo1; row selection signals output by the row decoder are used for carrying out row selection on pixel circuits in an array, the column decoder is used forcarrying out column selection on the column selection output circuit, and the reading circuit is used for calculating a difference value of Vo1 of two pixels selected front and back and quantizing the difference value to serve as response output of a PUF. According to the pixel circuit, the logarithmic converter in the array is extremely insensitive to fluctuation of power supply voltage, the reliability of PUF to the power supply voltage is greatly improved, unstable output response bits can be identified and filtered out through a threshold method, and therefore the reliability, especiallythe reliability to the temperature, can be further improved.

Description

[0001] [Technical field] [0002] The invention relates to the field of security technology, in particular to a physical unclonable function circuit for a CMOS dynamic vision image sensor. [0003] [Background technique] [0004] Today, visual sensor networks are expanding and ubiquitous. Thanks to advances in integrated circuits and technology, the quality of cameras has become better and more reliable, and their manufacturing costs have dropped dramatically. However, in some related application fields, such as traffic monitoring and intelligent assisted living, traditional frame-based imaging technology can no longer meet the requirements. In public surveillance scenarios in the field of transportation applications, in the face of rapidly changing scenarios, the performance of traditional frame-based imaging technology is mainly limited by its limited dynamic range and bandwidth; while in intelligent assisted living In the private surveillance scene in the application field...

AI Technical Summary

Problems solved by technology

Considering the various harsh environments involved in DVS applications, poor reliability has become the Achilles' heel of this PUF

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