关键词: 基准电压芯片, 高精度, 差分放大

Abstract: The precision accuracy of output voltage of reference voltage IC is the most important parameter,so when manufacture IC,it is more important to test them accurately.Thus it require higher test technology,the precision accuracy of test system must be more advanced than output voltage of IC.If the precision of test system is out of the limit of product,the signal should be amplified.The precision accuracy of ADR44X is 1 mV,and the precision accuracy of test system is 2.5 mV,amplifying the signal to 100 times then testing,so it can be used for the projectADR44X,and itisalso can be used for almostreference voltage IC.

Key words: reference voltage IC, high-accuracy, differentialamplification