采用过采样提高C8051F020片内ADC分辨率的研究

摘要

The resolution of the analog to digital converter is related to the more bits,the higher resolution, higher resolution device costs are also higher. C8051F020 on-chip ADC is a 12 bit,in order to reduce the cost of the system and achieve higher resolution,introduces the theory of over sampling and averaging method.The method can improve the resolution of the conversion and the signal-to-noise ratio,but increased CPU processing time and reduce the throughput of data.%模数转换的分辨率与器件的数字位数有关，位数越多分辨率越高，分辨率越高器件的成本也越高。C8051F020的片内ADC是12位的，为了既降低系统成本又获得较高的分辨率，介绍了过采样和求均值方法的实现原理。该方法有效提高转换的分辨率和信噪比，但增加CPU处理时间并降低了数据吞吐率。