小型放大器高速地驱动重容性负载

寄生电容潜藏在电路的每个角落，当调整电路中容性负载过重时，仔细选择运算放大器成为关键，以实现电压转换率、电流输出能力、功耗、反馈环路稳定性的最优化。可考虑用现有的小封装功率增强型放大器驱动重容性负载，也可采用电流反馈放大器如LT1397实现超宽带电路。TinyAmpliersDriveHeavyCapacitiveLoadsatSpeedDesignNote429KeeganLearyandBrianHamiltonIntroductionWithapackagethathasathermalresistanceof135°C/W,Parasiticcapacitancelurksbehindeverycornerofanthismuchcontinuouspowerwouldresultina148°Criseelectroniccircuit.FETgates,cabling,groundandpowerindietemperature.Iftheambienttemperatureis85°C,planesalladdtotheFaradbottomline.Whenthecapaci-thisbringsthedietoapackage-melting233°C!tiveloadgetsheavyinhighspeedcircuits,carefulopampToisolateCLOADfromtheamplier,adesigncoulduseselectionisparamountforoptimizingslewrate,currentaseriesresistor,RS.Thistechniqueultimatelylimits