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US 2006/0214829 A1Published application
Sigma delta analog-to-digital converter
AssigneeYokogawa Electric Corporation
InventorsMakoto Takeuchi, Naoki Maeda
Life of this patent
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Abstract
A ΣΔ analog-to-digital converter has a ΣΔ modulation section which executes ΣΔ modulation, and a digital filter which filters a digital signal output from the ΣΔ modulation section. The digital filter has gain properties that one of dips of a gain of the digital filter corresponds to a noise frequency which is, for example, the commercial frequency 60 Hz. Especially, the lowest frequency of the dips corresponds to the noise frequency.
Claims6
A ΣΔ analog-to-digital converter, comprising:
- a ΣΔ modulation section which executes ΣΔ modulation;
- and
- a digital filter which filters a digital signal output from the ΣΔ modulation section,
- wherein the digital filter has gain properties that one of dips of a gain of the digital filter corresponds to a frequency of a noise.
1 more element
A ΣΔ analog-to-digital converter, comprising:
- a ΣΔ modulation section which executes ΣΔ modulation;
- and
- a digital filter which filters a digital signal output from the ΣΔ modulation section,
- wherein the digital filter has gain properties combining a first cut-off filter that the lowest frequency of dips of a gain of the first cut-off filter corresponds to a frequency of a first noise, and a second cut-off filter that the lowest frequency of dips of a gain of the second cut-off filter corresponds to a frequency of a second noise.
1 more element
Dependencies are inferred from the claim text.