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:
Aug. 07, 2012
Filed:
May. 14, 2008
Minseok Park, Hitachinaka, JP;
Michiya Okada, Mito, JP;
Shuya Hagiwara, Mito, JP;
Hideki Tanaka, Hitachinaka, JP;
Minseok Park, Hitachinaka, JP;
Michiya Okada, Mito, JP;
Shuya Hagiwara, Mito, JP;
Hideki Tanaka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A DDS (direct digital synthesizer) remarkably increased in the number of frequencies which can be output while maintaining the phase coherency, and an NMR instrument using such a DDS are provided. A DDS including phase accumulators and a phase-to-amplitude modulator is provided with a plurality of phase accumulators operating with fixed phase implements which are equal to powers of 2, a controller for outputting each bit of a frequency tuning word as control data, a plurality of switches for outputting an output of an associated one of the phase accumulators when an associated one of the control data supplied from the controller is 1 and outputting 0 when the associated one of the control data is 0, and an adder for adding up outputs of the switches.