Merged Analog-Digital Circuits Using Pulse Modulation for Intelligent SoC Applications

Atsushi IWATA  Takashi MORIE  Makoto NAGATA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E84-A   No.2   pp.486-496
Publication Date: 2001/02/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: INVITED PAPER (Special Section on Analog Circuit Techniques Supporting the System LSI Era)
pulse modulation,  mixed analog-digital integrated circuits,  nonlinear dynamical systems,  switched current integration,  time-domain signal processing,  

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A merged analog-digital circuit architecture is proposed for implementing intelligence in SoC systems. Pulse modulation signals are introduced for time-domain massively parallel analog signal processing, and also for interfacing analog and digital worlds naturally within the SoC VLSI chip. Principles and applications of pulse-domain linear arithmetic processing are explored, and the results are expanded to the nonlinear signal processing, including an arbitrary chaos generation and continuous-time dynamical systems with nonlinear oscillation. Silicon implementations of the circuits employing the proposed architecture are fully described.