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%.
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%.
基金
国家自然科学基金(批准号:50237030)
浙江省自然科学基金(批准号:Z104441)资助项目~~