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一、引言目前,在很多场合下,需要一种能够将产生的模拟量直接变换成数字量的模拟/数字变换设备。实际应用中,具体变换器的选择决定于输入量的形式、频率、鉴别率、仪器精度和变换速度的要求。下面所叙述的变换器是用于将雷达及某些光学观测仪器等的轴角量变换成与之对应的数字量的装置。针对系统的输入量形式,我们采用了反馈型逐位编码交流变数字方案。其原理是正切函数变换网络,也有很多文章介绍了几种成功的方法:如数字译码器式、电阻分段逼近式等。所以本文只做简单叙述,而把重点放在一些问题的解决与探讨上。如对模拟信号的处理,变换速度(包括通道切换速度)和精度的折衷,及在保证整机强的适时性能前题下如何实现多通道的变换。最后对精度加以分析与计算。
I. INTRODUCTION At present, on many occasions, an analog / digital conversion device that can directly convert the generated analog quantity into a digital quantity is needed. In practice, the choice of a particular converter depends on the form of input, frequency, discrimination, instrument accuracy and conversion speed requirements. The converter described below is a device for converting a shaft angle of a radar and some optical observation instruments into a corresponding digital quantity. For the input form of the system, we have adopted a feedback-type bit-by-bit AC variable number scheme. The principle is tangent transform network, there are many articles introduced several successful methods: such as digital decoder type, resistance segmentation approximation and so on. Therefore, this article only briefly described, but to focus on the solution and discussion of some issues. Such as the processing of analog signals, the conversion speed (including the channel switching speed) and the accuracy of the compromise, and to ensure the timely performance of the machine before the issue of how to achieve multi-channel conversion. Finally, the precision analysis and calculation.