US Patent 7653678 Direct digital synthesis circuit
Patent 7653678 was granted and assigned to Freescale Semiconductor on January, 2010 by the United States Patent and Trademark Office.
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A direct digital synthesis circuit (108) includes a plurality of current sources (210, 211, 212), an output circuit (200), and a logical multiplier circuit (202). The output circuit (200) provides a synthesized waveform (164) output and includes a first (206) and second branch (208). The logical multiplier circuit (202) is operatively coupled to the plurality of current sources (210, 211, 212) and to the output circuit (200). The logical multiplier circuit (202) is operative to receive a plurality of signals. The logical multiplier circuit is also operative to selectively increase a first current flow through the first branch (206) by a determined magnitude and decrease a second current flow through the second branch (208) by the determined magnitude based on the plurality of signals. The synthesized waveform (164) is based on the first and second currents.
US Patent 07653678 Direct digital synthesis circuit US Patent 7653678 Direct digital synthesis circuit
US Patent 07653678 Direct digital synthesis circuit
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