New Non-Volatile Analog Memory Circuits Using PWM Methods

Shigeo KINOSHITA  Takashi MORIE  Makoto NAGATA  Atsushi IWATA  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.9   pp.1655-1661
Publication Date: 1999/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Integrated Electronics and New System Paradigms)
Category: Non-Binary Architectures
analog memory,  floating gate device,  pulse width modulation,  PWM,  

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This paper proposes non-volatile analog memory circuits using pulse-width modulation (PWM) methods. The conventional analog memory using floating gate device has a trade-off between programming speed and precision because of the constant width of write pulses. The proposed circuits attain high programming speed with high precision by using PWM write pulses. Three circuits are proposed and their performance is evaluated using SPICE simulation. The simulation results show that fast programming time less than 20 µs, high updating resolution of 11 bits, and high precision more than 7 bits are achieved.