Correlated Level Shifting技術による離散時間二次ΔΣA/D変換器のSQNR改善と高調波歪の抑制

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2021/12/01

タイトル(英語): Discreate-Time Second-Order Delta-Sigma A/D Modulator Improving SQNR and Suppressing Harmonic Distortions by Correlated Level Shifting Technique

著者名: 滝田　颯人（東京理科大学理工学研究科電気工学専攻），松浦　達治（東京理科大学理工学部電気電子情報工学科），岸田　亮（東京理科大学理工学部電気電子情報工学科），兵庫　明（東京理科大学理工学部電気電子情報工学科）

著者名(英語): Hayato Takita (Department of Electrical Engineering, Graduate School of Science and Technology, Tokyo University of Science), Tatsuji Matsuura (Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science), Ryo Kish

キーワード: 相関レベルシフト，ΔΣA/D変換器，信号対量子化雑音比，低消費電力，積分器　　correlated level shifting，delta-sigma analog-to-digital converter，signal-to-quantization noise ratio，low power consumption，integrator

要約(英語): Signal-to-quantization-noise ratio (SQNR) of discrete-time delta-sigma modulators (DTΔΣMs) are degraded when low-gain operational amplifiers (Op-Amps) are used. Correlated level shifting (CLS) technique has been proposed to compensate gain of Op-Amp in pipeline analog-to-digital converters. In this paper, we show that gain of the Op-Amps are improved by applying CLS technique to Op-Amps in the integrators of DTΔΣM, and SQNR is improved even if low-gain Op-Amps are used. The simulation results show that SQNR is improved by 6 dB and SQNR using 374x gain Op-Amp is equivalent to that using 30x gain with CLS technique, and considering nonlinearity of Op-Amps, harmonic distortions are suppressed by over 15 dB.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.141 No.12 （2021） 特集Ⅰ：電気・電子・情報関係学会東海支部連合大会　特集Ⅱ：研究会優秀論文

本誌掲載ページ: 1313-1320 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/141/12/141_1313/_article/-char/ja/