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Published 1989 | Published
Book Section - Chapter Open

An Electronic Photoreceptor Sensitive to Small Changes in Intensity


We describe an electronic photoreceptor circuit that is sensitive to small changes in incident light intensity. The sensitivity to changes in the intensity is achieved by feeding back to the input a filtered version of the output. The feedback loop includes a hysteretic element. The circuit behaves in a manner reminiscent of the gain control properties and temporal responses of a variety of retinal cells, particularly retinal bipolar cells. We compare the thresholds for detection of intensity increments by a human and by the circuit. Both obey Weber's law and for both the temporal contrast sensitivities are nearly identical.

Additional Information

© 1989 Morgan Kaufmann. This work was supported by the System Development Foundation and the Office of Naval Research. Chips were fabricated through the MOSIS foundry. We thank Frank Werblin for helpful comments and Mary Ann Maher for editorial assistance.

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Published - 137-an-electronic-photoreceptor-sensitive-to-small-changes-in-intensity.pdf



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August 19, 2023
March 5, 2024