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Adaptation of Current Signals with Floating-Gate Circuits |
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| Authors: | Alberto Pesavento Timothy Horiuchi Chris Diorio Christof Koch |
| Affiliation: | (1) Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, 91125;(2) Department of Electrical and Computer Engineering, University of Maryland, College Park, MD, 20742;(3) Department of Computer Science and Engineering, University of Washington, Seattle, WA, 98195-2350;(4) Computation and Neural Systems Program, California Institute of Technology, Pasadena, CA, 91125 |
| Abstract: | In this paper we present a new, adaptive spatial-derivative circuit for CMOS image sensors. The circuit removes its offset as a natural part of its operation using a combination of electron tunneling and hot-electron injection to add or remove charge on a floating-gate of an auto-zeroing amplifier. We designed, fabricated and successfully tested a chip with the circuit. Test results show that the circuit reduces the offsets by more than an order of magnitude. |
| Keywords: | CMOS visual sensors fixed-pattern noise removal floating-gate circuits |
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