基准源作为其中关键模块之一，不仅需要为系统提供精准的偏置电压和偏置电流，差分基准源还将为其提供比较电平和残差电压，它的性能将直接影响到系统指标。
Reference is the key part of ADC, not only providing the bias voltage and current for the system but also playing the part of the compared voltage and subtracted voltage.
如果你使用的手机显示器材质是超级tft屏，比如说新款的HTC手机，这种材质的暗电平还可以(但不是非常棒)，线条锐度比较高，非常好的色彩。
If you have a Super TFT screen like the newer HTC phones, your phone has good (not great) black levels, sharp lines, and fairly good colors.
对于硬件接口电路中常用的一些方法进行了简要的比较，并介绍了电平转换芯片MAX232及其应用方法。
It gives comparison among some methods which are often adopted in the interfacing circuit, and introduces a chip MAX232 of level translation and its application method in detail.
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