摘要
介绍了一种适用于核磁共振谱仪的全功能数字化频率源，它能够直接输出0～135 MHz的信号，且信号的频率、相位和幅度可以快速切换。该频率源设计成基于计算机PCI总线的板卡结构，可以直接插入PC机的PCI插槽内，在板上包含了128k用于预先存储波形数据的静态内存，外部设备提供触发信号即可输出所需的射频波形，该频率源具有结构简单，性能良好，成本低廉等特点，特别适用于较低设计成本的核磁共振谱仪。
A PCI based complete digital frequency source for use in thenuclear magnetic resonance spectrometer is described. This frequency source is capable of generating a frequency- and phase-continuous tunable signal with output frequencies ranging from dc to 135 MHz. The frequency source is designed in such a way that it can be inserted into one PCI slot of a personal computer. There are two pieces of on board SRAM（128 k） for storing the pre-defined waveform. The RF output waveform is controlled by an external trigger signal. The present design is suitable for use in low field NMR or MRI spectrometer because of its simplicity, high performance and low cost.
出处
《波谱学杂志》
CAS
CSCD
北大核心
2006年第2期209-215,共7页
Chinese Journal of Magnetic Resonance
