应用于轨到轨运放的一种低纹波电荷泵  

A low ripple charge pump for Rail-to-Rail Op amp applications

作　　者：赵自强 华国环[1,2] 刘清惓[1,2] 刘祖韬 张旭 ZHAO Zi-qiang;HUA Guo-huan;LIU Qing-quan;LIU Zu-tao;ZHANG Xu(Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Key Laboratory of Meteorological Observation and Information Processing,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学,江苏省大气环境与装备技术协同创新中心,南京210044 [2]南京信息工程大学,江苏省气象探测与信息处理重点实验室,南京210044

出　　处：《信息技术》2024年第11期1-8,共8页Information Technology

基　　金：国家自然科学基金面上项目(41875035,42275143)。

摘　　要：运放电路通常采用互补差分输入对的方式实现轨到轨输入,但输入级跨导的波动增大了运放设计难度。针对轨到轨运放输入级跨导恒定的问题,设计了一种宽输入范围低纹波电荷泵。利用振荡器产生时钟信号,控制数字逻辑电路,生成五对时钟不交叠的开关控制信号,来交替开启和关闭泵电容,在开关交替期间对泵电容进行预充放电,从而规避时钟馈通效应,降低输出纹波。电路使用0.35μmBCD工艺。仿真结果表明,在时钟频率为10MHz、负载500μA时,电荷泵输入电压2~5V,输出均可提升1.5~1.6V,输出纹波低于3mV,提高了电路内部电源的稳定性。The op amp circuit usually uses complementary differential input pairs to achieve Rail-to-Rail input,but the fluctuation of input stage trans-conductance fluctuation increases the difficulty of op amp design.To address the problem of constant trans-conductance of the Rail-to-Rail op amp input stage,a wide input range low ripple charge pump is designed.An oscillator is used to generate a clock signal and control a digital logic circuit to generate five pairs of clock non-crossover switching control signals to alternately turn on and off the pump capacitor and pre-charge and discharge the pump capacitor during the switching alternation,thus circumventing the clock feed-through effect and reducing output ripple.The circuit uses a 0.35μm BCD process.Simulation results show that at a clock frequency of 10MHz and a load of 500μA,the charge pump input voltage of 2~5V,the output can all be boosted by 1.5~1.6V,and the output ripple is less than 3mV,improves the stability of the circuit’s internal power supply.

关 键 词：电荷泵 低纹波 轨到轨 放大器 振荡器 

分 类 号：TN433[电子电信—微电子学与固体电子学]