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1. 发明授权

US5467294A High speed, low power direct digital synthesizer 失效
标题翻译：高速，低功耗直接数字合成器
公开(公告)号：US5467294A
公开(公告)日：1995-11-14
申请号：US207705
申请日：1994-03-09
申请人： Vince Hu , James Wang
发明人： Vince Hu , James Wang
IPC分类号： G01R31/28 , G06F1/03 , G06F1/02
CPC分类号： G06F1/0328 , G01R31/2841
摘要： A method and apparatus suitable for generating programmable digital sine waves which involves converting the output of a direct digital synthesizer or numerically controlled digital oscillator to a higher frequency with a multiplier-less structure that takes advantage of the properties of trigonometric identifies for sine and cosine. Sine waves are generated digitally using a phase accumulator which is clocked at one fundamental frequency. The phase accumulator input provides a control word which determines the intermediate frequency of the direct digital synthesizer output. Taking advantage of the periodicity of the phase accumulator operation, the outputs of the accumulator are utilized to address a read only memory ROM lookup table which produces in-phase and quadrature samples of the sine wave at the intermediate frequency. The in-phase and quadrature samples are then complemented (i.e. negated) to produce an additional set of in-phase and quadrature samples which are 180.degree. out of phase from the original samples. Switching between these four possible outputs at a higher fundamental clock frequency results in the translation of the intermediate frequency output to a higher frequency.
摘要翻译：一种适用于产生可编程数字正弦波的方法和装置，其涉及将直接数字合成器或数字控制数字振荡器的输出转换为更高频率的无乘法结构，其利用三角形的属性来识别正弦和余弦。使用在一个基频计时的相位累加器数字地产生正弦波。相位累加器输入提供决定直接数字合成器输出的中频的控制字。利用相位累加器操作的周期性，利用累加器的输出来寻址在中频产生正弦波的同相和正交采样的只读存储器ROM查找表。然后对同相和正交采样进行补码（即否定），以产生与原始采样相位相差180°的另外一组同相和正交采样。在更高的基本时钟频率下在这四个可能输出之间切换导致中频输出转换到较高频率。

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