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Noise Floor Reduction in Frequency Delta-Sigma Modulation Microphone Sensors
http://hdl.handle.net/10110/00020794
http://hdl.handle.net/10110/00020794709e6a16-881a-490c-a9b1-81d3d7f3fa01
名前 / ファイル | ライセンス | アクション |
---|---|---|
sensors-21-03470-Maezawa (3.4 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-05-19 | |||||
タイトル | ||||||
タイトル | Noise Floor Reduction in Frequency Delta-Sigma Modulation Microphone Sensors | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | delta-sigma modulation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | frequency delta-sigma modulation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | microphone | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | microwave oscillator | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | phase noise | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | cavity resonator | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | FPGA | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Maezawa, Koichi
× Maezawa, Koichi× Mori, Masayuki× Andoh, Hiroya |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Frequency delta-sigma modulator (FDSM) employing a variable frequency oscillator is a novel replacement of the classical delta-sigma modulators. This is advantageous for application to sensors, because an ADC can be intrinsically integrated with the sensors. We have already proposed to use this technique to various sensors. However, the signal-to-noise ratio was significantly degraded by noise floor, in the previous papers. In this paper, we have investigated the origin of the noise floor in the FDSM microphone sensors as a promising example. It was demonstrated that improving the phase noise of the oscillator can drastically reduce the noise floor. For this reduction we improved the Q-factor of the cavity resonator, and the design of the oscillator circuit. With these improvements, the phase noise, and, hence, the noise floor, were improved by approximately 40 dB. In addition, we obtained an SNR of 57 dB for 114 dBSPL sound input with 96 kHz bandwidth, which corresponds to the dynamic range of 87 dB for maximum 140 dBSPL. A much larger dynamic range of around 120 dB is expected by increasing the sampling rate and decreasing the Al diaphragm thickness. These results also indicate the promise of the FDSM to varieties of physical sensors. | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Sensors 2021, Vol. 21 No.10, 3470 | |||||
書誌情報 |
Sensor 巻 21, 号 10, p. 3470, 発行日 2021 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1424-8220 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.3390/s21103470 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
出版者 | ||||||
出版者 | MDPI | |||||
資源タイプ(DSpace) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Article |