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US 2006/0038709 A1Published application
Delta-sigma modulator with selectable noise transfer function
AssigneeSilicon Laboratories Inc.
InventorsAlbert Lu, Yan Zhou, Xun Yang
Life of this patent
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Abstract
Delta-sigma modulators with a selectable noise transfer function are described. In various embodiments, the noise transfer function is varied in accordance with a bandwidth, a communication protocol, or an oversampling ratio of a selected communication channel.
Claims17
An apparatus, comprising:
- a delta-sigma modulator having a variable noise transfer function.
A method comprising the steps:
- a) selecting a communication protocol for a first channel;
- and
- b) providing a delta-sigma modulator coupled to a communication medium carrying the first channel, the modulator having a variable noise transfer function selected to vary noise shaping within the selected channel in accordance with the selected communication protocol.
A method comprising the steps:
- a) providing a multi-channel communication medium supporting a first channel and a second channel, wherein the first channel has a bandwidth V;
- and
- b) providing a delta-sigma modulator coupled to the multi-channel communication medium, wherein the delta-sigma modulator is configured to have a first noise transfer function NTF1 if the second channel has a bandwidth BW1, wherein the delta-sigma modulator is configured to have a second noise transfer function NTF2 if the second channel has a bandwidth BW2.
A method comprising the steps:
- a) providing a delta-sigma modulator coupled to receive a broadband signal including a selected channel, wherein the delta-sigma modulator has a selectable noise transfer function;
- b) selecting a first noise transfer function NTF1 if the delta-sigma modulator processes the selected channel at a first oversampling ratio;
- and
- c) selecting a second noise transfer function NTF2, if the delta-sigma modulator processes the selected channel at a second oversampling ratio.
1 more element
Dependencies are inferred from the claim text.