可是，这种信号发生器的上限频率的提高受存储器的读取时间和数模转换器的转换速度的限制。为了提高数字法函数信号发生器的上限频率，我们提出了用分布存储式数字法生成函数信号。

However, extending the upper frequency of such function signal generator is limited by the read-out time of the memory and the conversion rate of the digital-to-analog converter.

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相比于传统的数模变换器，本发明结构简单，转换速度快，在转换信号位数较多时此种优势更加明显。

Compared with traditional digit-analog converter, the invention has simple structure, quick conversion speed. The merit is superior especially for relatively more conversion signal digit.

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