标签: telephones

摘要：介绍了影响噪声性能的移动电话手机问题。电源供应布局改善显示以减少噪音的问题。减少噪音低频率下的受雇线性稳压器。功率放大器偏压调节到射频输出上的噪音。低压差稳压器输出噪声被解释。Maxim>AppNotes>BATTERYMANAGEMENTPOWER-SUPPLYCIRCUITSKeywords:cellulartelephones,noise,powersupply,conducted,radiated,layout,GSM,TDMAJan24,2001APPLICATIONNOTE668ManagingNoiseinCell-PhoneHandsetsAbstract:Presentscellulartelephonehandsetissuesimpactingnoiseperformance.Powersupplylayoutimprovementsareshowntoreducenoiseproblems.Linearregulatorsareemployedtoreducenoiseatlowfrequencies.PoweramplifierbiasmodulatesnoiseontotheRFoutput.Lowdropoutregulatoroutputnoiseisexplained.Tobesthandletheproblemofcell-phonenoise,youshouldapplyanunderstandingofthephone'snoise-couplingmechanisms,noise-sensitivecircuitnodes,andnoise-generatingcircuits.Figure1.Switch-modeandlinearregu……