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Institute of Electrical and Electronics Engineers, IEEE Transactions on Electron Devices, 10(62), p. 3237-3243, 2015

DOI: 10.1109/ted.2015.2461660

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Single-Poly-EEPROM Cell in Standard CMOS Process for Medium-Density Applications

Journal article published in 2015 by Luca Milani, Fabrizio Torricelli ORCID, Zsolt Miklos Kovacs-Vajna
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

A new single-poly-EEPROM cell compatible with standard CMOS processes is proposed. A pMOS tunneling device is used for programming and erasing, and an nMOS transistor is used for reading and selecting the memory cell when it is in an array. The pMOS device is a minimum-sized digital transistor with the gate oxide of the input/output transistors. This improves the coupling capacitance, minimizes the area consumption, and guarantees the retention. The memory cell is programmed by band-to-band hot electrons and erased by Fowler-Nordheim tunneling. Thanks to the proposed writing scheme, the memory cell requires only a single triple-well. This further reduces the area consumption, and ensures, at the same time, fast and reliable memory operations. The measurements on programming, erasing, reading, cycling endurance, and data retention are provided using a 0.18-μm standard CMOS process. The memory cell area is 5.91 μm² in an array, and it can be programmed in tP = 1 ms, erased in t = 10 ms, and cycled for >10k times with a voltage window greater than 2 V.