公开(公告)号：US6411093B2

公开(公告)日：2002-06-25

申请号：US78040601

申请日：2001-02-12

申请人： BRUKER BIOSPIN AG

发明人： SCHWILCH ARTHUR ,  GOSTELI CHRISTOPH

IPC分类号： G01R33/36 ,  H03B28/00 ,  G01V3/00

CPC分类号： G01R33/3607

摘要： A method of operating a high-resolution NMR spectrometer comprising a DDS generator containing an NCOL for generating an LO frequency, wherein the frequency of the NCOL is defined by inputting a numerical value Z, is characterized in that this numerical value Z may assume only values which satisfy the equation Z=n.N/m, wherein Z, n, N, and m are integer and positive numbers, N is a power of 2 with a positive integer exponent, wherein said exponent represents the maximum number of bits during the calculation process, m is approximately 2.fs/DELTAB, n approximately m.fout/fs and m additionally a common integer divisor of n.N and fs is the clock frequency of the NCOL, DELTAB is the desired bandwidth with high spectral purity and fout is the output frequency of the NCOL. This method allows the use of a DDS generator even in the case where very high spectral purity is required, wherein in particular quantization noise is largely eliminated over the frequency range relevant for NMR measurements.

摘要翻译： 一种操作包括含有用于产生LO频率的NCOL的DDS发生器的高分辨率NMR光谱仪的方法，其中通过输入数值Z来定义NCOL的频率，其特征在于该数值Z可以仅取值 其满足方程Z = nN / m，其中Z，n，N和m是整数和正数，N是具有正整数指数的2的幂，其中所述指数表示在计算过程期间的最大比特数 ，m约为2.fs / DELTAB，n约为m.fout / fs，m为nN的公共整数除数，fs为NCOL的时钟频率，DELTAB为高频谱纯度的期望带宽，fout为输出 NCOL的频率。 即使在需要非常高的光谱纯度的情况下，该方法也允许使用DDS发生器，其中在与NMR测量相关的频率范围内，特别是消除了量化噪声。