【摘要】 针对高端电流检测放大器输入级对宽输入共模电压范围的要求,对宽输入共模电压范围放大器的输入结构开展了研究,提出了一种宽共模输入范围的输入级结构,特点是具有低输入偏置电流,并能兼顾高低共模电平工作的需要.给出了整个电流检测放大器的电路设计.该放大器在1.5μm BCD工艺下设计实现.芯片的测试结果表明,当采用5V单电源供电时,电路的输入共模范围可达0~30V,最大总误差不超过1.67%.更多还原

【Abstract】 In order to meet the demand for a wide input common-mode range (ICMR) required by high-side current-sensing amplifiers,input stages whose ICMR can exceed the supply rail were researched and analyzed.Combining the advantages of different circuit structures,a wide ICMR input stage having low input bias current was proposed.With the input stage,a current-sensing amplifier was designed and implemented in a 1.5μm BCD process.It can work at both high and low common mode voltages.The test results show that its ICMR is from 0 to 30V at a 5V supply voltage.Its total output error is below 1.67%.更多还原