Sunday, October 18, 2015

Omnivision Proposes PSRR Improvement

Omnivision patent application US20150288902 "Feed-forward technique for power supply rejection ratio improvement of bit line" by Tianjia Sun, Rui Wang, Liping Deng, and Tiejun Dai proposes an approach that reduces the structured row noise in image sensors:

"Limited by the design and layout constraints of pixel cells, the source follower circuits can suffer from an unsatisfactory power supply rejection ratio, such as −20 dB. An unsatisfactory power supply rejection ratio can present many challenges, including noise from power supplies that can enter into the output signal path. Furthermore, the ripple of power supplies can cause unwanted horizontal ripple in the captured image."

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