書誌事項
- タイトル別名
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- A Band-pass ΔΣ Modulator with Variable Center Frequency
- ニンイ ノ チュウシン シュウハスウ オ セッテイ カノウ ナ バンドパスDSヘンチョウキ
- A Band-pass ΔΣ Modulator with Variable Center Frequency
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Delta-sigma (ΔΣ) analog-to-digital converters (ADC's) have been used for the application area that requires high-resolution signal acquisition. Most of the ΔΣ ADC's use the low-pass type ΔΣ modulators, where it is necessary to prepare a sufficiently high sampling frequency than the input signal. On the other hand, it is useful to convert only a specific band signal with a high accuracy in sensing systems and voice-band telecommunications. In order to satisfy the demands, band-pass ΔΣ modulators have been proposed. Band-pass ΔΣ modulators, as opposed to the low-pass type modulators, are able to convert signals that have closer sampling frequencies. In addition, the band-pass ΔΣ modulators suppress the low-frequency noise. In general, however, the center frequency and sampling frequency of a band-pass modulator is determined at the design stage. Therefore, it is difficult to apply bandwidths that are different from the original intended design. This paper proposes a band-pass ΔΣ modulator with variable center frequency. The modulator is designed by using multistage structure, thereby the modulator's stability and accuracy has improved. Furthermore, a self-calibration method for noise leakage due to a mismatch between the analog loop filter and the back-end digital filter are also proposed. The modulator with proposed methods was investigated using MATLAB simulator, confirming the effectiveness of the band-pass ΔΣ modulator.
収録刊行物
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- 計測自動制御学会論文集
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計測自動制御学会論文集 51 (10), 678-686, 2015
公益社団法人 計測自動制御学会
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詳細情報 詳細情報について
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- CRID
- 1390001204510438144
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- NII論文ID
- 130005104372
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- NII書誌ID
- AN00072392
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- ISSN
- 18838189
- 04534654
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- NDL書誌ID
- 026816134
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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