DDS FREQUENCY SOURCE IN NMR

Chinese Journal of Magnetic Resonance ›› 2001, Vol. 18 ›› Issue (4): 351-355.

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DDS FREQUENCY SOURCE IN NMR

JIANG Yun, JIANG Yu, TAO Hong-yan, LI Geng-ying

Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Dept of Physics, East China Normal Univ., Shanghai 200062

Received:2001-06-29 Revised:2001-09-10 Published:2001-12-05 Online:2001-12-05
Supported by:
高等学校骨干教师资助计划项目.

Abstract

Abstract:

The use of DDS chip made it possible to simplify the design and reduce the cost of a pulsed nuclear magnetic resonance spectrometer. Herein, we will int roduce a DDS frequency source on ISA bus. Three DDS chips, AD 7008, were used in t his design. The resolutions of the frequency and the phase of this DDS board are 0.01Hz and 0.09°respectively. The implementation of this frequency source to NMR is discussed. Finally NMR experiment results are shown.

Key words: Direct Digital Synthesis, Frequency Source, Frequency-switching, Phase-switching, Amplitude Modulation, NMR

CLC Number:

O482.53⁺2

JIANG Yun, JIANG Yu, TAO Hong-yan, LI Geng-ying. DDS FREQUENCY SOURCE IN NMR[J]. Chinese Journal of Magnetic Resonance, 2001, 18(4): 351-355.

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DDS FREQUENCY SOURCE IN NMR

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