マツヤ ヤスユキ   MATSUYA Yasuyuki
  松谷 康之
   所属   青山学院大学  理工学部 電気電子工学科
   職種   教授
言語種別 日本語
発行・発表の年月 2016/11
形態種別 学術雑誌
査読 査読有り
標題 カオス2次ΔΣモジュレータの雑音特性
執筆形態 共同
巻・号・頁 1650178頁
著者・共著者 Eri Ioka, Nozomi Watanabe, Ryo Makishima, Yasuyuki Matsuya
概要 The chaotic delta sigma modulator is a way to suppress the limit cycle oscillation caused by the
input of a null or constant signal. By changing integrator gains, the output sequence becomes
chaotic and the noise characteristic of the output is changed. This noise characteristic is an
important factor for evaluating the performance of delta sigma modulation. The aim of this
study is to analyze the noise characteristic of chaotic double loop delta sigma modulation when
the null signal is input. We use a bifurcation diagram and FFT analysis to obtain the parameter
dependence of the output state and noise characteristic, respectively. The output status of the
chaotic double loop delta sigma modulation can be guessed from a bifurcation diagram with
the brute force method. We also investigate the noise characteristic of the output signal of the
chaotic modulator with FFT analysis and classify the various noise characteristics by changing
the integrator gains of the double loop delta sigma modulator. We use FFT and the bifurcation
diagram to classify these noise characteristics into three categories: suppressed tone (affected by
the chaos), divergence, and the appearance of the limit cycle oscillation. We also confirm the
existence of an unusual noise-shaping characteristic caused by the intermittent chaos.