日本地球惑星科学連合2015年大会

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セッション記号 P (宇宙惑星科学) » P-CG 宇宙惑星科学複合領域・一般

[P-CG31] 宇宙科学・探査の将来計画と関連する機器・技術の現状と展望

2015年5月27日(水) 18:15 〜 19:30 コンベンションホール (2F)

コンビーナ:*平原 聖文(名古屋大学太陽地球環境研究所)、小嶋 浩嗣(京都大学生存圏研究所)、高橋 幸弘(北海道大学・大学院理学院・宇宙理学専攻)、鈴木 睦(宇宙航空研究開発機構宇宙科学研究本部)

18:15 〜 19:30

[PCG31-P04] ASICを用いた小型プラズマ波動波形受信機のダイナミックレンジの改善

*糀 宏樹1尾崎 光紀1八木谷 聡1小嶋 浩嗣2頭師 孝拓2吉田 朗1 (1.金沢大学大学院自然科学研究科、2.京都大学生存圏研究所)

キーワード:アナログASIC, プラズマ波動波形受信機

Further reductions in mass, volume, and power of analog circuits are important in developing scientific instruments of plasma wave observations. Typical plasma wave receiver is roughly divided into two types: one is a waveform receiver and the other is a spectrum one. The waveform receiver provides a waveform with a high time resolution and phase information of a plasma wave. On the other hand, the spectrum receiver provides a frequency spectrum with a high frequency resolution and a high signal-to-noise ratio in comparison with waveform receivers.
We have been developing a plasma waveform receiver using Application Specific Integrated Circuit (ASIC) technology. Previous ASIC waveform receiver consists of a differential Gm-C Low-Path Filter (LPF), a main amplifier for the gain adjustment, a switched capacitor LPF for anti-aliasing with the cutoff frequency of 100 kHz, and a Gm-C LPF for reducing the clock pulse noise of the switched capacitor LPF. The previous ASIC receiver shows a sufficient low noise performance (210 nV/sqrt(Hz) at 10 kHz) and low power consumption (60 mW). However, the dynamic range of output voltage is not sufficient due to using operational transconductance amplifiers (OTAs) of Gm-C LPFs. In order to improve the dynamic range of the ASIC receiver, we have redesigned the ASIC receiver to exclude OTAs. In this study, we used active LPFs consisting of operational amplifiers (OPAs) instead of Gm-C LPFs using OTAs. As a result, the dynamic range increased by 80%. Moreover, the layout area decreased by 18%, and the number of transistors decreased by 60% in comparison with the previous ASIC receiver.
In this presentation, we will present the design principles of our ASIC receiver for plasma wave observations and discuss its electrical performances in detail.