System and method for spectral shaping of dither signals
AssigneeBroadcom Corporation
InventorKevin Miller
Life of this patent
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Abstract
A digital modulator includes a quantizer and a mapper. The quantizer converts a dithered signal value to a voltage. The mapper provides a modulated signal based on the voltage received from the quantizer. The mapper may maintain a substantially identical average centroid for modulated signals provided by the mapper. In an aspect, the mapper is included in a feedback of the digital modulator. The digital modulator may include any number of mappers. For example, a mode selection switch may select one of a plurality of mappers to map a voltage level received from the quantizer to a respective digital sequence.
Claims24
An apparatus comprising:
- a quantizer to convert a dithered signal value to one of a plurality of voltages;
- a mapper to provide a modulated signal based on one of the plurality of voltages;
- and
- a feedback to feed the modulated signal back to the quantizer.
An apparatus comprising:
- a plurality of mappers;
- a mode selection switch to select one of the plurality of mappers to map a voltage level to a respective digital sequence;
- and
- a quantizer to provide the voltage level based on a dithered signal value.
Dependencies are inferred from the claim text.