Transmitter, signal-synthesizing circuit, and signal-synthesizing method
AssigneeNEC Corporation
InventorsKeiichi Motoi, Shinichi Hori, Kazumi Shiikuma
Life of this patent
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Abstract
A transmitter includes: a modulation circuit for modulating a baseband signal into a multi-bit digital signal containing a radio frequency band component; a plurality of switch mode amplifiers each provided corresponding to a respective bit of the multi-bit digital signal supplied from the modulation circuit; and a signal-synthesizing circuit. The signal-synthesizing circuit connects a band-restricting unit that restricts the band of the output signals of the plurality of switch mode amplifiers and a voltage-current conversion unit that converts output signals of the switch mode amplifiers from voltage into current to perform signal synthesizing.
Claims31
A transmitter comprising:
- a modulation circuit that modulates a baseband signal into a multi-bit digital signal that contains a radio frequency band component;
- a plurality of switch-mode amplifiers each provided corresponding to a respective bit of said multi-bit digital signal that is supplied from said modulation circuit;
- and
- a signal-synthesizing circuit that connects a filter that restricts the band of output signals of said plurality of switch-mode amplifiers and a voltage-current conversion circuit that converts output signals of said switch-mode amplifiers from voltage to current to perform signal synthesizing.
A signal-synthesizing circuit comprising:
- a filter that restricts the band of output signals of a plurality of switch-mode amplifiers that are each provided corresponding to a respective bit of a multi-bit digital signal;
- and
- a voltage-current conversion circuit that converts output signals of said switch-mode amplifiers from voltage to current;
- wherein said filter and said voltage-current conversion circuit are connected to perform signal synthesizing.
A signal-synthesizing method wherein a signal-synthesizing circuit is provided with:
- a filter that restricts the band of output signals of a plurality of switch-mode amplifiers that are each provided corresponding to a respective bit of a multi-bit digital signal;
- and
- a voltage-current conversion circuit that converts output signals of said switch-mode amplifiers from voltage to current;
- wherein said signal-synthesizing circuit connects said filter and said voltage-current conversion circuit to perform signal synthesizing.
Dependencies are inferred from the claim text.