In the process of developing and adjusting the product in this project, we need some signal sources, which usually afford square or sine wave. Generally the square ware is used for digit logic, but for the analog signal wave is used to judge the linearity's qualities and other functions of the electric circuit. However the common ready-made signal sourceis all unidirectional sine wave, the signal sources whose phase shift can arbitrarily be regulatedand which have precise phase are still not available one the current market.
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