| With a rapid development of Biomedical Electronics, the research field has been constantly wide spread and has been playing a more and more important role, all of which display a broad prospect of development. Nowadays, there is a contradiction between the recovering demands of cerebrovascular patients, who actually are increasing fastly in the world, and the disadvanced instruments for cerebrovascular diseases. To solve the contradiction, a new international hot topic, which is about how to further study and promote the variational cerebral blood vessel's function on the basis of present cerebrovascular morphology diagnosis, has come out. Therefore, both the academic and market urge a demand of a new type of device which is more suitable for patients' treatment of circulatory function.Traditional waveform generator of brain-cycle device forms analog circuits. It is not only poor in accuracy and stability, but also bulky and inflexible. At present, the popular device is poor adaptability , high prices and not linking with other instruments. In order to overcome these shortcomings, this paper designed the following two Programmes.(1)Based on the DE2 development system and the Quartus II software, the prototype system of electrical stimulation waveform generator is designed with the "TOP-DOWN" Design Method. With VHDL, it achieved the functional modules of Waveform memory, embedded phase-locked loop and DDFS. At last, fitting system and locking resources, it formed a prototype system.(2) Based on SCM and DDFS, it is to design hardware and software in AWG, which included SCM system, double-port RAM realization inside the FPA, passive serial configuration between FPGA and SCM. After repeated debugging, the system can output the waveforms with frequency ranges, good stability, highly accuracy. Through experiments, the two design options achieved the predetermined requirements. It proved the projects viable, which carry out the waves in rCBF system.
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