Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2011-04-19
2011-04-19
Nguyen, Linh V (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000, C708S270000, C708S271000, C708S273000, C708S276000, C327S105000, C327S107000, C327S106000
Reexamination Certificate
active
07928881
ABSTRACT:
The present invention relates to a direct digital frequency synthesizer using a variable sine wave-weighted digital to analog converter with improved size and efficiency and a synthesizing method thereof. The direct digital frequency synthesizer and the synthesizing method thereof are capable of simplifying a configuration for matching output data of a phase accumulator to sine wave amplitude without increase in complexity of a DAC by applying a nonlinear DAC for directly generating a current corresponding to base points with sine weights and a variable sine wave-weighted DAC for generating fine currents to be combined with variable weights based on the base points. Accordingly, it is possible to provide a high quality output, reduce a size and power consumption, and increase a speed.
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Baek Joon Hyun
Baek Kwang-Hyun
Jung Jae-Hun
Jung Yun-Hwan
Yeoh Hong Chang
Beusse Wolter Sanks Mora & Maire, P.A.
Chung-Ang University Industry—Academy Cooperation Foundat
DeAngelis John L.
Nguyen Linh V
ZARAMTECHNOLOGY Co. Ltd.
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