这是一个采用功能扩展的方法而组成的10位A/D转换器实用线路,其工作原理框图示于图1。被转换的输入电压V_(?)首先加到一个2位A/D转换器,该转换器位数少,容易用中小规模电路组成。我们知道,对于一个2位二进制A/D转换器而言,其分辨率仅为V_(im)/4(V_(im)指规定的满度输入值),所以,输出的2位数A、B与对应的模拟量V_D,以及实际输入的电压V_(?)三者之间的关系符合下表: This is a functional expansion of the 10-bit A / D converter circuit composed of practical methods, the block diagram shown in Figure 1. The converted input voltage, V_ (?), Is first applied to a 2-bit A / D converter that has fewer bits and is easily composed of small and medium-sized circuits. We know that for a 2-bit binary A / D converter, its resolution is only V_ (im) / 4 (V_ (im) refers to the full scale input value), so the output 2-digit A, B and the corresponding analog V_D, and the actual input voltage V_ (?) The relationship between the three in line with the following table: