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介绍了为乳腺专用正电子发射断层扫描仪PEM(Positron Emission Mammography)电子学数据获取(Data Acquisition,DAQ)系统提供稳定、可靠、抗干扰的高精度同步时钟的电路,它采用了基于单片机和高精度时钟产生芯片的电路设计方法,可以得到多路可控时钟信号。设计中采用差分传输,大大降低了时钟信号之间的干扰,同时由于电路引入了CAN总线控制,使得时钟信号可以根据需要被同时输出或者屏蔽。
The circuit for providing stable, reliable and anti-jamming high-precision synchronous clock for the Positron Emission Mammography (PEM) data acquisition (DAQ) system is introduced. The circuit uses single chip microcomputer and high Accurate clock generation chip circuit design method, you can get multiple controllable clock signal. Differential transmission design, greatly reducing the interference between the clock signal, while the introduction of CAN bus control circuit, making the clock signal can be output at the same time, or shielding.