自校正频率输出模块的设计

The design of serf - correcting frequency output module

提出一种新型电压频率转换电路用于提高基于LM33压频电路的频率输出精度。在实际应用中，由于环境变化和元件参数的差异，频率输出的精度很难满足设计要求，所提出的方法通过输出反馈控制实现了精确的频率输出，并且作为某新型瓦斯监控系统的一部分，实现了200Hz～1000Hz1‰精度的频率输出。

This paper proposes a new voltage frequency convert circuit for improving precision of frequency based on LM331. In practical applicability, because the environmental variation and the part of component disaccord,the precision of frequency cannot satisfy the design request. The proposed method achieve the precise frequency output by feedback control. As a part of new gas supervisory system,it realizes the 200Hz - 1000Hz,1‰ preeision frequency output.