Bit reduction in a transmitter
AssigneeSony Corporation
InventorsStuart Francis GLYNN, Shinichi Tananbe
Life of this patent
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Abstract
A digital baseband signal for radio frequency transmission is processed prior to performing digital-to-analog conversion. The digital baseband signal is filtered. The number of bits of the digital baseband signal is reduced to minimise the size of the digital-to-analog converter. By performing some of the bit reduction before filtering, the size of the filter circuit is reduced whilst still meeting relevant performance parameters.
Claims33
A method of processing an input digital baseband signal for radio frequency transmission, prior to supplying the processed digital baseband signal to a digital-to-analog converter, the input digital baseband signal having a number of bits greater than the processed digital baseband signal supplied to the digital-to-analog converter, the method comprising:
- first reducing the number of bits of the input digital baseband signal;
- filtering the input digital baseband signal after said first reducing of the number of bits;
- and
- further reducing the number of bits of the input digital baseband signal after said filtering.
An integrated circuit for processing an input digital baseband signal for radio frequency transmission, the input digital baseband signal having a predetermined number of bits, the integrated circuit comprising:
- a first bit reduction circuit arranged to reduce the number of bits of the input digital baseband signal;
- a filter circuit arranged to filter the digital baseband signal output from the first bit reduction circuit;
- a second bit reduction circuit arranged to reduce the number of bits of the digital baseband signal output from the filter circuit;
- and
- a digital-to-analog converter arranged to perform digital-to-analog conversion of the digital baseband signal output from the second bit reduction circuit and having a number of bits less than the predetermined number of bits of the input digital baseband signal.
Dependencies are inferred from the claim text.