按对数或准对数法则的模—数变换器已引起人们的特别注意。它的主要特性:其一是动态范围大,它不仅能解决动态范围很大的数据测量,而且几乎能够在整个动态范围內进行编码。故可用来处理动态范围有若干数量级(Cascade)数据的模拟变量,所以对于数据检测、编码和传输以及几乎所有的实验物理场合、仪器设备、数据处理和连续的远距离通讯系统等都有实用意义。其二是相对精度几乎恒定,当测量要求是一个恒定的 Analog-to-digital converters based on logarithm or quasi-logarithmic rules have drawn particular attention. Its main features are as follows: One is its large dynamic range, which not only solves data with a large dynamic range but also encodes almost the entire dynamic range. It can be used to process analog variables with several Cascade data in the dynamic range. Therefore, it has practical significance for data detection, coding and transmission, and in almost all experimental physics, instrumentation, data processing and continuous long-distance communication systems . The second is that the relative accuracy is almost constant when the measurement requirement is constant