低压差线性电压调整器噪声电压测试方法-中国测试.PDFVIP

第43卷第11期 中国测试 Vol.43 No.11 2017年 11月 CHINA MEASUREMENT TEST November，2017 doi院10.11857/j.issn.1674-5124.2017.11.005 低压差线性电压调整器噪声电压测试方法 罗 军袁 刘 焱袁 王小强袁 罗宏伟 （工业和信息化部电子第五研究所，广东 广州 510610） 摘 要院低压差线性电压调整器在便携应用中除需要实现电压转换功能外袁还必须满足专用电路的噪声要求遥噪声电 压作为低压差线性电压调整器的关键指标之一袁它限制电路能够处理的最小信号电平遥 为适应新型低压差线性电压 调整器的低噪声测量需求袁该文提出采用电池供电与实时信号分析仪相结合的噪声电压测试方法袁该方法通过降低 低压差线性电压调整器输入噪声对输出噪声的影响袁具有测量精度较高尧测试灵活尧平台搭建简单等特点遥 文中对比 分析采用直流电源供电与采用电池供电的噪声电压测试方法袁实验结果表明院采用电池供电的噪声电压测试方法可 以满足10滋V量级的噪声电压测试需求袁达到对低压差线性电压调整器噪声电压进行准确考核的目的遥 关键词院低压差线性电压调整器曰噪声谱密度曰噪声电压曰测试方法 文献标志码院A 文章编号院1674-5124渊2017冤11-0022-04 Noise voltage testing method of low dropout linear regulator LUO Jun袁 LIU Yan袁 WANG Xiaoqiang袁 LUO Hongwei 渊CEPREI袁Guangzhou 510610袁China冤 Abstract: In addition to realizing the function of voltage regulating袁 the low dropout linear regulator 渊LDO冤 shall also meet the noise requirement for specific circuit in portable applications. As a key indicator of LDO袁 noise voltage limits the minimum signal level that can be processed by the circuit. To meet the requirement of low noise measurement of a new LDO袁 a noise voltage testing method using real time analyzing 渊signal analyzer冤 and battery powering is proposed. The presented method can reduce the effects of input noise of LDO on output noise and has the advantages of high measured accuracy袁 flexible testing and simple platform constructing. Two noise voltage testing methods袁 direct-current powering and battery powering袁 are compared in the paper. Results show that the presented method can measure low noise voltage whose level ups to 10滋V