The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2002
Filed:
Feb. 12, 2001
Arthur Schwilch, Bruetten, CH;
Christoph Gosteli, Cambridge, MA (US);
Bruker BioSpin AG, Faellanden, CH;
Abstract
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=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·f /&Dgr;B, n approximately m·f /f and m additionally a common integer divisor of n·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.