扩展标准运算放大器的输入电压范围

摘要：利用自己的输出，引导高输入电压范围（高达76V）低压差电压调节器（MAX6771），这个电路扩展的CMOS运算放大器（MAX4162）的输入范围，同时保持其高输入阻抗和极低的输入偏置电流（1pA的）。Maxim>AppNotes>AmplifierandComparatorCircuitsPower-SupplyCircuitsKeywords:opamps,low-dropoutvoltageregulators,LDOregulators,CMOSopamps,voltagefollowersJan12,2011APPLICATIONNOTE4566ExtendingtheInputVoltageRangeofStandardOpAmpsAbstract:Usingitsownoutputtobootstrapalow-dropoutvoltageregulator(MAX6771)withhighinput-voltagerange(upto76V),thiscircuitextendstheinputrangeofaCMOSopamp(MAX4162)whilepreservingitshighinputimpedanceandverylowinputbiascurrent(<1pA).AsimilarversionofthisarticleappearedintheApril15,2007issueofEETimesmagazine.Mostmodernoperationalamplifiersoperateovera5V(or±2.5V)orlowervoltagerange.Forapplicationsrequiringalargervoltageswing,such