Bruker Biospin Ag

Christoph Gosteli

Arthur Schwilch

A method of operating a high-resolution NMR spectrometer comprising a DDS generator containing an NCO for generating an LO frequency, wherein the frequency of the NCO 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&equals;n&middot;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&middot;f /&Dgr;B, n approximately m&middot;f /f and m additionally a common integer divisor of n&middot;N and f is the clock frequency of the NCO , &Dgr;B is the desired bandwidth with high spectral purity and f is the output frequency of the NCO . 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.

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Cambridge, MA, United States of America

Christoph Gosteli