Adaptation of Current Signals with Floating-Gate Circuits

Authors:
Alberto Pesavento;Timothy Horiuchi;Chris Diorio;Christof Koch
Affiliations:
Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, 91125;Department of Electrical and Computer Engineering, University of Maryland, College Park, MD, 20742;Department of Computer Science and Engineering, University of Washington, Seattle, WA, 98195-2350;Computation and Neural Systems Program, California Institute of Technology, Pasadena, CA, 91125
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2002

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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.