A Discrete Fourier Analyzer Based on Analog VLSI Technology

Shoji KAWAHITO  Kazuyuki TAKEDA  Takanori NISHIMURA  Yoshiaki TADOKORO  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.7   pp.1049-1056
Publication Date: 1994/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Super Chip for Intelligent Integrated Systems)
integrated electronics,  discrete Fourier transform,  analog VLSI,  current-mode circuits,  

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This paper presents a discrete Fourier analyzer using analog VLSI technology. An analog current-mode technique is employed for implementing it by a regular array structure based on the straight-forward discrete Fourier transform (DFT) algorithm. The basic components are 1-dimensional (1-D) analog current-mode multiplier array for fixed coefficient multiplication, two-dimensional (2-D) analog switch array and wired summations. The proposed scheme can process speedily N-point DFT in a time proportional to N. Possibility of the realization of the analog DFT VLSI based on 1 µm technology is discussed from the viewpoints of precision, speed, area, and power dissipation. In the case of 1024-point DFT, the standard deviation of the total error is estimated to be about 2%, the latency, or processing time is about 110 µs, and the signal sample rate based on a pipeline manner is about 4.7 MHz. A prototype MOS integrated circuit of the 16-point multiplier array has been implemented and a typical operation using the multiplier array has been confirmed.