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随着集成运放生产水平的发展,目前国内已陆续出现几种高精度运放产品,它们的开环电压增益和共模抑制比都在120db 以上。我厂生产的XFC83高精度运放A_(VD)可达140db,K_(CMR)可达130db,而目前国产各种运放参数测试仪,这两项参数的测试指标一般最高为120db,在测试大于120db 的A_(VD)和K_(CMR)时,测试精度和重复性都比较差。通过对A_(VD)和K_(CMR)测试原理的分析不难理解,高A_(VD)、高K_(CMR)的测量实质上是对微弱信号电平的测量,对于A_(VD)>120db 来说,
With the development of integrated op amp production level, several kinds of high-precision op amp products have appeared in China at present, and their open-loop voltage gain and common mode rejection ratio are both above 120db. I plant the XFC83 high-precision op amp A_ (VD) up to 140db, K_ (CMR) up to 130db, and currently made a variety of op amp parameter tester, the two parameters of the test index is generally up to 120db, during the test Greater than 120db A_ (VD) and K_ (CMR), the test accuracy and repeatability are relatively poor. It can be easily understood from the analysis of test principle of A_ (VD) and K_ (CMR) that measurement of high A_ (VD) and high K_ (CMR) is essentially a measurement of weak signal level, For example,